macOS: hotplugging a monitor marks it as removed

[slouken]

When I plug a second monitor into my Mac Mini M1 running macOS 15.1.1, I get an event that the display was added, then immediately removed.

The debug output shows:

2025-01-18 08:58:31.192 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:31.192 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:31.192 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:31.194 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:31.221 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:31.221 testsprite[71613:27427842]  - kCGDisplayMovedFlag
2025-01-18 08:58:31.221 testsprite[71613:27427842]  - kCGDisplaySetModeFlag
2025-01-18 08:58:31.221 testsprite[71613:27427842]  - kCGDisplayAddFlag
2025-01-18 08:58:31.221 testsprite[71613:27427842]  - kCGDisplayEnabledFlag
2025-01-18 08:58:31.221 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 08:58:31.222 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:31.222 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 08:58:31.226 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:31.226 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:31.226 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:31.226 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:31.227 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:31.227 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:31.246 testsprite[71613:27427842] SDL_EVENT_DISPLAY_ADDED 8
2025-01-18 08:58:31.246 testsprite[71613:27427842] Display 1 '1': 2560x1440 at 0,0
2025-01-18 08:58:31.246 testsprite[71613:27427842] Display 8 '8': 1920x1080 at -1920,84
2025-01-18 08:58:31.246 testsprite[71613:27427842] SDL_EVENT_DISPLAY_MOVED 8
2025-01-18 08:58:31.246 testsprite[71613:27427842] Display 1 '1': 2560x1440 at 0,0
2025-01-18 08:58:31.246 testsprite[71613:27427842] Display 8 '8': 1920x1080 at -1920,84
2025-01-18 08:58:33.000 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.000 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.000 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:33.000 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayMovedFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplaySetModeFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayAddFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayRemoveFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayEnabledFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayDisabledFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
add and remove
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.006 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.006 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 08:58:33.006 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:33.006 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 08:58:33.006 testsprite[71613:27427842] SDL_EVENT_DISPLAY_REMOVED 8
2025-01-18 08:58:33.006 testsprite[71613:27427842] Display 1 '1': 2560x1440 at 0,0
2025-01-18 08:58:33.048 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.048 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.048 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:33.048 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 08:58:33.065 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 08:58:33.065 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 08:58:34.565 testsprite[71613:27427842] 1147.00 frames per second

For reference, when the display is removed, the sequence is:

2025-01-18 09:03:53.828 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 09:03:53.828 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 09:03:53.828 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 09:03:53.828 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 09:03:53.845 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 09:03:53.845 testsprite[71613:27427842]  - kCGDisplayRemoveFlag
2025-01-18 09:03:53.845 testsprite[71613:27427842]  - kCGDisplayDisabledFlag
2025-01-18 09:03:53.845 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 09:03:53.845 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 09:03:53.845 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 09:03:53.846 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 09:03:53.846 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 09:03:53.846 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1

When I connect an iPad as a second display, the sequence is:

2025-01-18 09:05:17.922 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 09:05:17.922 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 09:05:17.922 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=5
2025-01-18 09:05:17.922 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 09:05:17.976 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=5
2025-01-18 09:05:17.976 testsprite[71613:27427842]  - kCGDisplayMovedFlag
2025-01-18 09:05:17.976 testsprite[71613:27427842]  - kCGDisplaySetModeFlag
2025-01-18 09:05:17.976 testsprite[71613:27427842]  - kCGDisplayAddFlag
2025-01-18 09:05:17.976 testsprite[71613:27427842]  - kCGDisplayEnabledFlag
2025-01-18 09:05:17.976 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 09:05:17.984 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 09:05:17.984 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 09:05:18.104 testsprite[71613:27427842] SDL_EVENT_DISPLAY_ADDED 9
2025-01-18 09:05:18.105 testsprite[71613:27427842] Display 1 '1': 2560x1440 at 0,0
2025-01-18 09:05:18.105 testsprite[71613:27427842] Display 9 '9': 1288x946 at -1288,0
2025-01-18 09:05:18.105 testsprite[71613:27427842] SDL_EVENT_DISPLAY_MOVED 9
2025-01-18 09:05:18.105 testsprite[71613:27427842] Display 1 '1': 2560x1440 at 0,0
2025-01-18 09:05:18.105 testsprite[71613:27427842] Display 9 '9': 1288x946 at -1288,0

and when I remove it, the sequence is:

2025-01-18 09:05:59.777 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=5
2025-01-18 09:05:59.777 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 09:05:59.777 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 09:05:59.777 testsprite[71613:27427842]  - kCGDisplayBeginConfigurationFlag
2025-01-18 09:05:59.831 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=5
2025-01-18 09:05:59.831 testsprite[71613:27427842]  - kCGDisplayRemoveFlag
2025-01-18 09:05:59.831 testsprite[71613:27427842]  - kCGDisplayDisabledFlag
2025-01-18 09:05:59.831 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 09:05:59.831 testsprite[71613:27427842] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 09:05:59.831 testsprite[71613:27427842]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 09:05:59.834 testsprite[71613:27427842] SDL_EVENT_DISPLAY_REMOVED 9
2025-01-18 09:05:59.834 testsprite[71613:27427842] Display 1 '1': 2560x1440 at 0,0

[maia-s]

I tried it here with an usb-c connected monitor, and I got (with testsprite --info all --log all):

...
2025-01-18 18:19:28.123 testsprite[19978:19708253] SDL EVENT: Window 2 shown
2025-01-18 18:19:28.146 testsprite[19978:19708253] SDL EVENT: Window 2 exposed
2025-01-18 18:19:32.818 testsprite[19978:19708253] 75.40 frames per second
2025-01-18 18:19:37.715 testsprite[19978:19708253] SDL EVENT: Display 3 attached
2025-01-18 18:19:37.715 testsprite[19978:19708253] SDL EVENT: Display 3 removed
2025-01-18 18:19:37.822 testsprite[19978:19708253] 68.15 frames per second
2025-01-18 18:19:39.299 testsprite[19978:19708253] SDL EVENT: Window 2 moved to 463,257
2025-01-18 18:19:39.299 testsprite[19978:19708253] SDL EVENT: Display 4 attached
2025-01-18 18:19:39.299 testsprite[19978:19708253] SDL EVENT: Window 2 display changed to 4
2025-01-18 18:19:39.299 testsprite[19978:19708253] SDL EVENT: Display 4 changed position
2025-01-18 18:19:39.299 testsprite[19978:19708253] SDL EVENT: Display 1 changed position
2025-01-18 18:19:42.827 testsprite[19978:19708253] 55.56 frames per second
2025-01-18 18:19:43.413 testsprite[19978:19708253] SDL EVENT: Mouse entered window 2
2025-01-18 18:19:43.743 testsprite[19978:19708253] SDL EVENT: Window 2 gained keyboard focus
2025-01-18 18:19:43.743 testsprite[19978:19708253] SDL EVENT: Clipboard updated
2025-01-18 18:19:43.999 testsprite[19978:19708253] +[IMKClient subclass]: chose IMKClient_Modern
2025-01-18 18:19:44.000 testsprite[19978:19708253] +[IMKInputSession subclass]: chose IMKInputSession_Modern
2025-01-18 18:19:44.625 testsprite[19978:19708253] SDL EVENT: Keyboard: key pressed in window 2: scancode 0x00000029 = Escape, keycode 0x0000001B = Escape, mods = NONE

ie display 3 is attached and immediately removed, then display 4 is attached after. (i only attached the monitor once)

[slouken]

@maia-s, can you enable the debug printing code in Cocoa_DisplayReconfigurationCallback() and run that again?

[slouken]

I also added this patch to testsprite, to help with debugging:

diff --git a/test/testsprite.c b/test/testsprite.c
index e8d8a7dcb..c49db59bc 100644
--- a/test/testsprite.c
+++ b/test/testsprite.c
@@ -556,9 +556,35 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
 
 SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
 {
+    static bool show = true;
     if (event->type == SDL_EVENT_RENDER_DEVICE_RESET) {
         LoadSprite(icon);
     }
+    switch (event->type) {
+    case SDL_EVENT_DISPLAY_ADDED:
+        SDL_Log("SDL_EVENT_DISPLAY_ADDED %d\n", event->display.displayID);
+        show = true;
+        break;
+    case SDL_EVENT_DISPLAY_REMOVED:
+        SDL_Log("SDL_EVENT_DISPLAY_REMOVED %d\n", event->display.displayID);
+        show = true;
+        break;
+    case SDL_EVENT_DISPLAY_MOVED:
+        SDL_Log("SDL_EVENT_DISPLAY_MOVED %d\n", event->display.displayID);
+        show = true;
+        break;
+    }
+    if (show) {
+        SDL_DisplayID *displays = SDL_GetDisplays(NULL);
+        int i;
+        for (i = 0; displays[i]; ++i) {
+            SDL_DisplayID d = displays[i];
+            SDL_Rect rect;
+            SDL_GetDisplayBounds(d, &rect);
+            SDL_Log("Display %d '%s': %dx%d at %d,%d\n", d, SDL_GetDisplayName(d), rect.w, rect.h, rect.x, rect.y);
+        }
+        show = false;
+    }
     return SDLTest_CommonEventMainCallbacks(state, event);
 }
 

[maia-s]

Sure thing:

2025-01-18 18:47:55.471 testsprite[21017:19734897] SDL EVENT: Window 2 shown
2025-01-18 18:47:55.582 testsprite[21017:19734897] SDL EVENT: Window 2 exposed
2025-01-18 18:48:00.171 testsprite[21017:19734897] 73.98 frames per second
2025-01-18 18:48:02.855 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:48:02.855 testsprite[21017:19734897]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:48:02.855 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:48:02.855 testsprite[21017:19734897]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:48:02.861 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:48:02.861 testsprite[21017:19734897]  - kCGDisplayMovedFlag
2025-01-18 18:48:02.861 testsprite[21017:19734897]  - kCGDisplaySetMainFlag
2025-01-18 18:48:02.861 testsprite[21017:19734897]  - kCGDisplaySetModeFlag
2025-01-18 18:48:02.861 testsprite[21017:19734897]  - kCGDisplayAddFlag
2025-01-18 18:48:02.861 testsprite[21017:19734897]  - kCGDisplayEnabledFlag
2025-01-18 18:48:02.861 testsprite[21017:19734897]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:48:02.861 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:48:02.862 testsprite[21017:19734897]  - kCGDisplayMovedFlag
2025-01-18 18:48:02.864 testsprite[21017:19734897]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:48:02.868 testsprite[21017:19734897] SDL EVENT: Window 2 moved to 463,257
2025-01-18 18:48:02.868 testsprite[21017:19734897] SDL_EVENT_DISPLAY_ADDED 3
2025-01-18 18:48:02.868 testsprite[21017:19734897] Display 3 '3': 1920x1080 at 0,0
2025-01-18 18:48:02.868 testsprite[21017:19734897] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:48:02.868 testsprite[21017:19734897] SDL EVENT: Display 3 attached
2025-01-18 18:48:02.868 testsprite[21017:19734897] SDL EVENT: Window 2 display changed to 3
2025-01-18 18:48:02.868 testsprite[21017:19734897] SDL_EVENT_DISPLAY_MOVED 3
2025-01-18 18:48:02.868 testsprite[21017:19734897] Display 3 '3': 1920x1080 at 0,0
2025-01-18 18:48:02.868 testsprite[21017:19734897] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:48:02.868 testsprite[21017:19734897] SDL EVENT: Display 3 changed position
2025-01-18 18:48:02.868 testsprite[21017:19734897] SDL_EVENT_DISPLAY_MOVED 1
2025-01-18 18:48:02.868 testsprite[21017:19734897] Display 3 '3': 1920x1080 at 0,0
2025-01-18 18:48:02.868 testsprite[21017:19734897] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:48:02.879 testsprite[21017:19734897] SDL EVENT: Display 1 changed position
2025-01-18 18:48:05.219 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:48:05.219 testsprite[21017:19734897]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:48:05.219 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:48:05.219 testsprite[21017:19734897]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:48:05.279 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:48:05.279 testsprite[21017:19734897]  - kCGDisplayRemoveFlag
2025-01-18 18:48:05.279 testsprite[21017:19734897]  - kCGDisplayDisabledFlag
2025-01-18 18:48:05.279 testsprite[21017:19734897]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:48:05.279 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:48:05.279 testsprite[21017:19734897]  - kCGDisplayMovedFlag
2025-01-18 18:48:05.279 testsprite[21017:19734897]  - kCGDisplaySetMainFlag
2025-01-18 18:48:05.279 testsprite[21017:19734897]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:48:05.285 testsprite[21017:19734897] SDL EVENT: Window 2 moved to 463,270
2025-01-18 18:48:05.285 testsprite[21017:19734897] SDL EVENT: Window 2 display changed to 1
2025-01-18 18:48:05.285 testsprite[21017:19734897] SDL_EVENT_DISPLAY_REMOVED 3
2025-01-18 18:48:05.285 testsprite[21017:19734897] Display 1 '1': 1512x982 at 0,0
2025-01-18 18:48:05.285 testsprite[21017:19734897] SDL EVENT: Display 3 removed
2025-01-18 18:48:05.285 testsprite[21017:19734897] SDL_EVENT_DISPLAY_MOVED 1
2025-01-18 18:48:05.285 testsprite[21017:19734897] Display 1 '1': 1512x982 at 0,0
2025-01-18 18:48:05.285 testsprite[21017:19734897] SDL EVENT: Display 1 changed position
2025-01-18 18:48:05.286 testsprite[21017:19734897] 54.35 frames per second
2025-01-18 18:48:09.198 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:48:09.198 testsprite[21017:19734897]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:48:09.198 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:48:09.198 testsprite[21017:19734897]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:48:09.210 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:48:09.210 testsprite[21017:19734897]  - kCGDisplayMovedFlag
2025-01-18 18:48:09.210 testsprite[21017:19734897]  - kCGDisplaySetMainFlag
2025-01-18 18:48:09.210 testsprite[21017:19734897]  - kCGDisplaySetModeFlag
2025-01-18 18:48:09.210 testsprite[21017:19734897]  - kCGDisplayAddFlag
2025-01-18 18:48:09.210 testsprite[21017:19734897]  - kCGDisplayEnabledFlag
2025-01-18 18:48:09.210 testsprite[21017:19734897]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:48:09.211 testsprite[21017:19734897] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:48:09.211 testsprite[21017:19734897]  - kCGDisplayMovedFlag
2025-01-18 18:48:09.211 testsprite[21017:19734897]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL EVENT: Window 2 moved to 463,257
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL_EVENT_DISPLAY_ADDED 4
2025-01-18 18:48:09.215 testsprite[21017:19734897] Display 4 '4': 1920x1080 at 0,0
2025-01-18 18:48:09.215 testsprite[21017:19734897] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL EVENT: Display 4 attached
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL EVENT: Window 2 display changed to 4
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL_EVENT_DISPLAY_MOVED 4
2025-01-18 18:48:09.215 testsprite[21017:19734897] Display 4 '4': 1920x1080 at 0,0
2025-01-18 18:48:09.215 testsprite[21017:19734897] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL EVENT: Display 4 changed position
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL_EVENT_DISPLAY_MOVED 1
2025-01-18 18:48:09.215 testsprite[21017:19734897] Display 4 '4': 1920x1080 at 0,0
2025-01-18 18:48:09.215 testsprite[21017:19734897] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:48:09.215 testsprite[21017:19734897] SDL EVENT: Display 1 changed position
2025-01-18 18:48:10.301 testsprite[21017:19734897] 67.00 frames per second
2025-01-18 18:48:13.068 testsprite[21017:19734897] SDL EVENT: Mouse entered window 2
2025-01-18 18:48:13.805 testsprite[21017:19734897] SDL EVENT: Window 2 gained keyboard focus
2025-01-18 18:48:13.805 testsprite[21017:19734897] SDL EVENT: Clipboard updated
2025-01-18 18:48:14.055 testsprite[21017:19734897] +[IMKClient subclass]: chose IMKClient_Modern
2025-01-18 18:48:14.055 testsprite[21017:19734897] +[IMKInputSession subclass]: chose IMKInputSession_Modern
^[2025-01-18 18:48:15.301 testsprite[21017:19734897] 59.99 frames per second
2025-01-18 18:48:15.341 testsprite[21017:19734897] SDL EVENT: Keyboard: key pressed in window 2: scancode 0x00000029 = Escape, keycode 0x0000001B = Escape, mods = NONE

Before this, after I added the patches, I also had a run where everything seemed to work alright with only one attach:

...
2025-01-18 18:45:54.598 testsprite[20981:19732749] SDL EVENT: Window 2 shown
2025-01-18 18:45:54.756 testsprite[20981:19732749] SDL EVENT: Window 2 exposed
2025-01-18 18:45:59.278 testsprite[20981:19732749] 73.40 frames per second
2025-01-18 18:46:01.280 testsprite[20981:19732749] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:46:01.280 testsprite[20981:19732749]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:46:01.280 testsprite[20981:19732749] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:46:01.280 testsprite[20981:19732749]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:46:01.293 testsprite[20981:19732749] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:46:01.293 testsprite[20981:19732749]  - kCGDisplayMovedFlag
2025-01-18 18:46:01.293 testsprite[20981:19732749]  - kCGDisplaySetMainFlag
2025-01-18 18:46:01.293 testsprite[20981:19732749]  - kCGDisplaySetModeFlag
2025-01-18 18:46:01.293 testsprite[20981:19732749]  - kCGDisplayAddFlag
2025-01-18 18:46:01.293 testsprite[20981:19732749]  - kCGDisplayEnabledFlag
2025-01-18 18:46:01.293 testsprite[20981:19732749]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:46:01.295 testsprite[20981:19732749] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:46:01.295 testsprite[20981:19732749]  - kCGDisplayMovedFlag
2025-01-18 18:46:01.295 testsprite[20981:19732749]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL EVENT: Window 2 moved to 463,257
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL_EVENT_DISPLAY_ADDED 3
2025-01-18 18:46:01.306 testsprite[20981:19732749] Display 3 '3': 1920x1080 at 0,0
2025-01-18 18:46:01.306 testsprite[20981:19732749] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL EVENT: Display 3 attached
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL EVENT: Window 2 display changed to 3
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL_EVENT_DISPLAY_MOVED 3
2025-01-18 18:46:01.306 testsprite[20981:19732749] Display 3 '3': 1920x1080 at 0,0
2025-01-18 18:46:01.306 testsprite[20981:19732749] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL EVENT: Display 3 changed position
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL_EVENT_DISPLAY_MOVED 1
2025-01-18 18:46:01.306 testsprite[20981:19732749] Display 3 '3': 1920x1080 at 0,0
2025-01-18 18:46:01.306 testsprite[20981:19732749] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:46:01.306 testsprite[20981:19732749] SDL EVENT: Display 1 changed position
2025-01-18 18:46:04.291 testsprite[20981:19732749] 58.46 frames per second
2025-01-18 18:46:04.492 testsprite[20981:19732749] SDL EVENT: Mouse entered window 2
2025-01-18 18:46:05.145 testsprite[20981:19732749] SDL EVENT: Mouse left window 2
2025-01-18 18:46:05.958 testsprite[20981:19732749] SDL EVENT: Mouse entered window 2
2025-01-18 18:46:06.212 testsprite[20981:19732749] SDL EVENT: Window 2 gained keyboard focus
2025-01-18 18:46:06.212 testsprite[20981:19732749] SDL EVENT: Clipboard updated
^[2025-01-18 18:46:06.462 testsprite[20981:19732749] +[IMKClient subclass]: chose IMKClient_Modern
2025-01-18 18:46:06.463 testsprite[20981:19732749] +[IMKInputSession subclass]: chose IMKInputSession_Modern
2025-01-18 18:46:08.048 testsprite[20981:19732749] SDL EVENT: Keyboard: key pressed in window 2: scancode 0x00000029 = Escape, keycode 0x0000001B = Escape, mods = NONE

[maia-s]

This one is more similar to the run in my first post with the detach happening instantly after the first attach

2025-01-18 18:54:09.104 testsprite[21066:19739082] SDL EVENT: Window 2 shown
2025-01-18 18:54:09.230 testsprite[21066:19739082] SDL EVENT: Window 2 exposed
2025-01-18 18:54:13.795 testsprite[21066:19739082] 73.93 frames per second
2025-01-18 18:54:18.803 testsprite[21066:19739082] 80.09 frames per second
2025-01-18 18:54:20.373 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:54:20.373 testsprite[21066:19739082]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:54:20.374 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:54:20.375 testsprite[21066:19739082]  - kCGDisplayAddFlag
2025-01-18 18:54:20.375 testsprite[21066:19739082]  - kCGDisplayEnabledFlag
2025-01-18 18:54:20.375 testsprite[21066:19739082]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:54:20.379 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:54:20.379 testsprite[21066:19739082]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:54:20.380 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:54:20.380 testsprite[21066:19739082]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:54:20.382 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:54:20.382 testsprite[21066:19739082]  - kCGDisplayRemoveFlag
2025-01-18 18:54:20.382 testsprite[21066:19739082]  - kCGDisplayDisabledFlag
2025-01-18 18:54:20.382 testsprite[21066:19739082]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:54:20.382 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:54:20.382 testsprite[21066:19739082]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:54:20.385 testsprite[21066:19739082] SDL_EVENT_DISPLAY_ADDED 3
2025-01-18 18:54:20.385 testsprite[21066:19739082] Display 1 '1': 1512x982 at 0,0
2025-01-18 18:54:20.385 testsprite[21066:19739082] SDL EVENT: Display 3 attached
2025-01-18 18:54:20.385 testsprite[21066:19739082] SDL_EVENT_DISPLAY_REMOVED 3
2025-01-18 18:54:20.385 testsprite[21066:19739082] Display 1 '1': 1512x982 at 0,0
2025-01-18 18:54:20.385 testsprite[21066:19739082] SDL EVENT: Display 3 removed
2025-01-18 18:54:23.808 testsprite[21066:19739082] 67.73 frames per second
2025-01-18 18:54:24.621 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:54:24.621 testsprite[21066:19739082]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:54:24.621 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:54:24.621 testsprite[21066:19739082]  - kCGDisplayBeginConfigurationFlag
2025-01-18 18:54:24.640 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=3
2025-01-18 18:54:24.640 testsprite[21066:19739082]  - kCGDisplayMovedFlag
2025-01-18 18:54:24.640 testsprite[21066:19739082]  - kCGDisplaySetMainFlag
2025-01-18 18:54:24.640 testsprite[21066:19739082]  - kCGDisplaySetModeFlag
2025-01-18 18:54:24.640 testsprite[21066:19739082]  - kCGDisplayAddFlag
2025-01-18 18:54:24.640 testsprite[21066:19739082]  - kCGDisplayEnabledFlag
2025-01-18 18:54:24.640 testsprite[21066:19739082]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:54:24.641 testsprite[21066:19739082] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 18:54:24.641 testsprite[21066:19739082]  - kCGDisplayMovedFlag
2025-01-18 18:54:24.641 testsprite[21066:19739082]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL EVENT: Window 2 moved to 463,257
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL_EVENT_DISPLAY_ADDED 4
2025-01-18 18:54:24.652 testsprite[21066:19739082] Display 4 '4': 1920x1080 at 0,0
2025-01-18 18:54:24.652 testsprite[21066:19739082] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL EVENT: Display 4 attached
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL EVENT: Window 2 display changed to 4
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL_EVENT_DISPLAY_MOVED 4
2025-01-18 18:54:24.652 testsprite[21066:19739082] Display 4 '4': 1920x1080 at 0,0
2025-01-18 18:54:24.652 testsprite[21066:19739082] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL EVENT: Display 4 changed position
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL_EVENT_DISPLAY_MOVED 1
2025-01-18 18:54:24.652 testsprite[21066:19739082] Display 4 '4': 1920x1080 at 0,0
2025-01-18 18:54:24.652 testsprite[21066:19739082] Display 1 '1': 1512x982 at -1512,0
2025-01-18 18:54:24.652 testsprite[21066:19739082] SDL EVENT: Display 1 changed position
2025-01-18 18:54:27.960 testsprite[21066:19739082] SDL EVENT: Mouse entered window 2
2025-01-18 18:54:28.384 testsprite[21066:19739082] SDL EVENT: Window 2 gained keyboard focus
2025-01-18 18:54:28.384 testsprite[21066:19739082] SDL EVENT: Clipboard updated
2025-01-18 18:54:28.630 testsprite[21066:19739082] +[IMKClient subclass]: chose IMKClient_Modern
2025-01-18 18:54:28.630 testsprite[21066:19739082] +[IMKInputSession subclass]: chose IMKInputSession_Modern
^[2025-01-18 18:54:28.809 testsprite[21066:19739082] 53.19 frames per second
2025-01-18 18:54:29.200 testsprite[21066:19739082] SDL EVENT: Keyboard: key pressed in window 2: scancode 0x00000029 = Escape, keycode 0x0000001B = Escape, mods = NONE

[icculus]

Connecting to a Roku Ultra over the network with AirPlay. First COCOA DISPLAY RECONFIG block is me clicking "disconnect" on the Roku in System Preferences. Second block is me reconnecting to it.

macbuildbot:buildbot icculus$ ./test/testsprite
2025-01-18 15:48:16.006 testsprite[4147:12544798] Display 1 'PHL 276E8V': 1920x1080 at 0,0
2025-01-18 15:48:16.006 testsprite[4147:12544798] Display 2 'Roku Ultra (AirPlay)': 1920x1080 at 1920,0
2025-01-18 15:48:20.638 testsprite[4147:12544798] 117.61 frames per second
2025-01-18 15:48:25.637 testsprite[4147:12544798] 120.00 frames per second
2025-01-18 15:48:28.272 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=52
2025-01-18 15:48:28.272 testsprite[4147:12544798]  - kCGDisplayBeginConfigurationFlag
2025-01-18 15:48:28.272 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 15:48:28.272 testsprite[4147:12544798]  - kCGDisplayBeginConfigurationFlag
2025-01-18 15:48:28.286 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=52
2025-01-18 15:48:28.286 testsprite[4147:12544798]  - kCGDisplayRemoveFlag
2025-01-18 15:48:28.286 testsprite[4147:12544798]  - kCGDisplayDisabledFlag
2025-01-18 15:48:28.286 testsprite[4147:12544798]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 15:48:28.286 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 15:48:28.286 testsprite[4147:12544798]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 15:48:28.292 testsprite[4147:12544798] SDL_EVENT_DISPLAY_REMOVED 2
2025-01-18 15:48:28.292 testsprite[4147:12544798] Display 1 'PHL 276E8V': 1920x1080 at 0,0
2025-01-18 15:48:30.649 testsprite[4147:12544798] 541.70 frames per second
2025-01-18 15:48:35.650 testsprite[4147:12544798] 1103.78 frames per second
2025-01-18 15:48:36.626 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 15:48:36.626 testsprite[4147:12544798]  - kCGDisplayBeginConfigurationFlag
2025-01-18 15:48:36.626 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=53
2025-01-18 15:48:36.626 testsprite[4147:12544798]  - kCGDisplayBeginConfigurationFlag
2025-01-18 15:48:36.667 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=53
2025-01-18 15:48:36.667 testsprite[4147:12544798]  - kCGDisplayMovedFlag
2025-01-18 15:48:36.667 testsprite[4147:12544798]  - kCGDisplaySetModeFlag
2025-01-18 15:48:36.667 testsprite[4147:12544798]  - kCGDisplayAddFlag
2025-01-18 15:48:36.667 testsprite[4147:12544798]  - kCGDisplayEnabledFlag
2025-01-18 15:48:36.667 testsprite[4147:12544798]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 15:48:36.674 testsprite[4147:12544798] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 15:48:36.674 testsprite[4147:12544798]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 15:48:36.729 testsprite[4147:12544798] SDL_EVENT_DISPLAY_ADDED 4
2025-01-18 15:48:36.730 testsprite[4147:12544798] Display 1 'PHL 276E8V': 1920x1080 at 0,0
2025-01-18 15:48:36.730 testsprite[4147:12544798] Display 4 'Roku Ultra (AirPlay)': 1920x1080 at 1920,0
2025-01-18 15:48:36.730 testsprite[4147:12544798] SDL_EVENT_DISPLAY_MOVED 4
2025-01-18 15:48:36.730 testsprite[4147:12544798] Display 1 'PHL 276E8V': 1920x1080 at 0,0
2025-01-18 15:48:36.730 testsprite[4147:12544798] Display 4 'Roku Ultra (AirPlay)': 1920x1080 at 1920,0
2025-01-18 15:48:40.653 testsprite[4147:12544798] 248.25 frames per second
2025-01-18 15:48:45.662 testsprite[4147:12544798] 133.76 frames per second

[icculus]

2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayAddFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayRemoveFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayEnabledFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayDisabledFlag

wtf, it set all of these in one callback?

[slouken]

2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayAddFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayRemoveFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayEnabledFlag
2025-01-18 08:58:33.004 testsprite[71613:27427842]  - kCGDisplayDisabledFlag

wtf, it set all of these in one callback?

Yep!

[slouken]

So it looks like in your case it doesn't set both, so in theory if both are set we can assume it's connected?

[icculus]

Seems like the quickest fix to do that.

CGDisplayIsOnline() reports true during this callback for disconnecting devices, infuriatingly.

But, add this real fast to the callback:

    SDL_Log("DISPLAY IS ONLINE: %s", CGDisplayIsOnline(displayid) ? "true" : "false");
    SDL_Log("DISPLAY IS %dx%d", (int) CGDisplayPixelsWide(displayid), (int) CGDisplayPixelsHigh(displayid));

When I disconnect the Roku, it's still reported as online (probably changes right after this callback), but the display size becomes 0x0. It has a correct size when adding.

[slouken]

Okay, adding:

2025-01-18 13:27:54.031 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:54.031 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:54.031 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.031 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:54.031 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:54.031 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:54.031 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.031 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:54.034 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:54.034 testsprite[85899:27827661]  - kCGDisplayMovedFlag
2025-01-18 13:27:54.034 testsprite[85899:27827661]  - kCGDisplaySetModeFlag
2025-01-18 13:27:54.034 testsprite[85899:27827661]  - kCGDisplayAddFlag
2025-01-18 13:27:54.034 testsprite[85899:27827661]  - kCGDisplayEnabledFlag
2025-01-18 13:27:54.034 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:27:54.034 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.034 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:54.035 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:54.035 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:27:54.035 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.035 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:54.035 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:54.035 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:54.035 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.035 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:54.035 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:54.035 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:54.035 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.035 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:54.035 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:54.038 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.038 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:54.038 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:54.038 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:54.038 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:54.041 testsprite[85899:27827661] SDL_EVENT_DISPLAY_ADDED 6
2025-01-18 13:27:54.041 testsprite[85899:27827661] Display 1 'DELL U3219Q': 2560x1440 at 0,0
2025-01-18 13:27:54.041 testsprite[85899:27827661] Display 6 'SMB2330HD': 1920x1080 at -1920,84
2025-01-18 13:27:54.041 testsprite[85899:27827661] SDL_EVENT_DISPLAY_MOVED 6
2025-01-18 13:27:54.041 testsprite[85899:27827661] Display 1 'DELL U3219Q': 2560x1440 at 0,0
2025-01-18 13:27:54.041 testsprite[85899:27827661] Display 6 'SMB2330HD': 1920x1080 at -1920,84
2025-01-18 13:27:56.118 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.118 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.118 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.118 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.118 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.118 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.118 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.118 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.138 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplayMovedFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplaySetModeFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplayAddFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplayRemoveFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplayEnabledFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplayDisabledFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.138 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.138 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.138 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:27:56.138 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.175 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.175 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.175 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.175 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.175 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.175 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.175 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.175 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.175 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.175 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.175 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.175 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.176 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.177 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.177 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.177 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.177 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.177 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.177 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.177 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.177 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.177 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.177 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.180 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.180 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:27:56.180 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.180 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.180 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.180 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:27:56.180 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.180 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.180 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.180 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.180 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.180 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.180 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.189 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:27:56.189 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.189 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.189 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:27:56.189 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.189 testsprite[85899:27827661] DISPLAY IS 1920x1080
2025-01-18 13:27:56.189 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:27:56.189 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:27:56.189 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:27:56.190 testsprite[85899:27827661] SDL_EVENT_DISPLAY_REMOVED 6
2025-01-18 13:27:56.190 testsprite[85899:27827661] Display 1 'DELL U3219Q': 2560x1440 at 0,0

and then removing:

2025-01-18 13:29:07.561 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:29:07.561 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:29:07.561 testsprite[85899:27827661] DISPLAY IS ONLINE: false
2025-01-18 13:29:07.561 testsprite[85899:27827661] DISPLAY IS 1x1
2025-01-18 13:29:07.561 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:29:07.561 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:29:07.561 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:29:07.561 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:29:07.565 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=2
2025-01-18 13:29:07.565 testsprite[85899:27827661]  - kCGDisplayRemoveFlag
2025-01-18 13:29:07.565 testsprite[85899:27827661]  - kCGDisplayDisabledFlag
2025-01-18 13:29:07.565 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:29:07.565 testsprite[85899:27827661] DISPLAY IS ONLINE: false
2025-01-18 13:29:07.565 testsprite[85899:27827661] DISPLAY IS 1x1
2025-01-18 13:29:07.565 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:29:07.565 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:29:07.565 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:29:07.565 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:29:07.565 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:29:07.565 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:29:07.565 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:29:07.569 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:29:07.569 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:29:07.569 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:29:07.569 testsprite[85899:27827661] DISPLAY IS 2560x1440

Connecting my iPad:

2025-01-18 13:19:03.404 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:19:03.404 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:19:03.404 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:03.404 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:19:03.404 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=7
2025-01-18 13:19:03.404 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:19:03.404 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:03.404 testsprite[85899:27827661] DISPLAY IS 1288x946
2025-01-18 13:19:03.459 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=7
2025-01-18 13:19:03.459 testsprite[85899:27827661]  - kCGDisplayMovedFlag
2025-01-18 13:19:03.459 testsprite[85899:27827661]  - kCGDisplaySetModeFlag
2025-01-18 13:19:03.459 testsprite[85899:27827661]  - kCGDisplayAddFlag
2025-01-18 13:19:03.459 testsprite[85899:27827661]  - kCGDisplayEnabledFlag
2025-01-18 13:19:03.474 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:19:03.474 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:03.474 testsprite[85899:27827661] DISPLAY IS 1288x946
2025-01-18 13:19:03.476 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:19:03.476 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:19:03.477 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:03.477 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:19:03.484 testsprite[85899:27827661] SDL_EVENT_DISPLAY_ADDED 3
2025-01-18 13:19:03.484 testsprite[85899:27827661] Display 1 'DELL U3219Q': 2560x1440 at 0,0
2025-01-18 13:19:03.484 testsprite[85899:27827661] Display 3 'Sidecar Display (AirPlay)': 1288x946 at -1288,0
2025-01-18 13:19:03.484 testsprite[85899:27827661] SDL_EVENT_DISPLAY_MOVED 3
2025-01-18 13:19:03.484 testsprite[85899:27827661] Display 1 'DELL U3219Q': 2560x1440 at 0,0
2025-01-18 13:19:03.504 testsprite[85899:27827661] Display 3 'Sidecar Display (AirPlay)': 1288x946 at -1288,0

Disconnecting my iPad:

2025-01-18 13:19:41.260 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=7
2025-01-18 13:19:41.260 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:19:41.260 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:41.260 testsprite[85899:27827661] DISPLAY IS 0x0
2025-01-18 13:19:41.260 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:19:41.260 testsprite[85899:27827661]  - kCGDisplayBeginConfigurationFlag
2025-01-18 13:19:41.260 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:41.260 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:19:41.268 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=7
2025-01-18 13:19:41.268 testsprite[85899:27827661]  - kCGDisplayRemoveFlag
2025-01-18 13:19:41.268 testsprite[85899:27827661]  - kCGDisplayDisabledFlag
2025-01-18 13:19:41.268 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:19:41.268 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:41.285 testsprite[85899:27827661] DISPLAY IS 0x0
2025-01-18 13:19:41.285 testsprite[85899:27827661] COCOA DISPLAY RECONFIG CALLBACK! display=1
2025-01-18 13:19:41.285 testsprite[85899:27827661]  - kCGDisplayDesktopShapeChangedFlag
2025-01-18 13:19:41.285 testsprite[85899:27827661] DISPLAY IS ONLINE: true
2025-01-18 13:19:41.285 testsprite[85899:27827661] DISPLAY IS 2560x1440
2025-01-18 13:19:41.297 testsprite[85899:27827661] SDL_EVENT_DISPLAY_REMOVED 3
2025-01-18 13:19:41.298 testsprite[85899:27827661] Display 1 'DELL U3219Q': 2560x1440 at 0,0

[icculus]

Screw it, let's go with the other plan and see what happens. I'm pushing a fix.

[slouken]

Potential fix:

diff --git a/src/video/cocoa/SDL_cocoamodes.m b/src/video/cocoa/SDL_cocoamodes.m
index 7de75729c..9a63e779d 100644
--- a/src/video/cocoa/SDL_cocoamodes.m
+++ b/src/video/cocoa/SDL_cocoamodes.m
@@ -405,8 +405,13 @@ static void Cocoa_DisplayReconfigurationCallback(CGDirectDisplayID displayid, CG
     }
 
     if ((flags & kCGDisplayAddFlag) && (flags & kCGDisplayRemoveFlag)) {
-        // both adding _and_ removing? Treat it as a remove exclusively. This can happen if a display is unmirroring because it's being disabled, etc.
-        flags &= ~kCGDisplayAddFlag;
+        if (CGDisplayPixelsWide(displayid) > 1) {
+            // Final state is connected
+            flags &= ~kCGDisplayRemoveFlag;
+        } else {
+            // Final state is disconnected
+            flags &= ~kCGDisplayAddFlag;
+        }
     }
 
     if (flags & kCGDisplayAddFlag) {

[icculus]

Oh, connecting a Roku when it defaults to mirrored got this, which is probably where the comment came from:

2025-01-18 16:38:54.395 testsprite[5163:12614333]  - kCGDisplayMovedFlag
2025-01-18 16:38:54.395 testsprite[5163:12614333]  - kCGDisplaySetModeFlag
2025-01-18 16:38:54.395 testsprite[5163:12614333]  - kCGDisplayAddFlag
2025-01-18 16:38:54.395 testsprite[5163:12614333]  - kCGDisplayEnabledFlag
2025-01-18 16:38:54.395 testsprite[5163:12614333]  - kCGDisplayMirrorFlag
2025-01-18 16:38:54.395 testsprite[5163:12614333]  - kCGDisplayDesktopShapeChangedFlag

AddFlag (added) and MirrorFlag (removed, because it's not a separate display anymore).