New subject: [Bug 55629] user32:monitor fails on macOS due to unsupported display modes

21 Sep 2023

      https://bugs.winehq.org/show_bug.cgi?id=55629

            Bug ID: 55629
           Summary: user32:monitor fails on macOS due to unsupported
                    display modes
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: wine-bugs(a)winehq.org
          Reporter: fgouget(a)codeweavers.com

user32:monitor fails on macOS due to unsupported display modes:

monitor.c:448: Test failed: Unexpected ChangeDisplaySettingsExA() return code
for vid_modes_test[1]: -2
monitor.c:448: Test failed: Unexpected ChangeDisplaySettingsExA() return code
for vid_modes_test[4]: -2

See https://test.winehq.org/data/patterns.html#user32:monitor

Where -2 == DISP_CHANGE_BADMODE

The failures correspond to failing to change the resolution to 1024x768 in the
must_succeed case. Because the DM_BITSPERPEL flag is not set, this is not
caused by the lack of support for changing the display's bit depth (see bug
55628). In fact, if I understand correctly, winemac.drv's
macdrv_ChangeDisplaySettings() always ignores dmBitsPerPel so it should not
fail even if DM_BITSPERPEL was set.

So it must be that some display modes, specifically 1024x768, are not supported
on macOS, or more specifically, in this test configuration (see also bug
55559).

The failures are systematic and only happen on macOS (see Remi's
rbernon-macos-* cloud test machines).

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[Bug 55629] New: user32:monitor fails on macOS due to unsupported display modes

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