[Bug 110697] glXWaitForMscOML and glXWaitVideoSyncSGI may block indefinitely

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110697

--- Comment #2 from acc12345acc at gmail.com ---
Sure.

- CPU: Intel Core i5-3210M
- GPU: Intel HD Graphics 4000
- Distribution: Arch Linux
- Kernel version: 5.0.7-arch1-1-ARCH
- Mesa version: 19.0.4
- X.Org version: 1.20.4
- Using modesetting driver
- /etc/X11/xorg.conf.d/20-i.conf:
```
Section "Screen"
  Identifier "default"
  DefaultDepth 24
EndSection
```

The test case has been mentioned already. However I forgot to include
reproduction steps:
1. Compile kwin-lowlatency (mkdir build && cd build && cmake .. && make)
2. Launch it with `QT_PLUGIN_PATH="$PWD/bin" ./bin/kwin_x11 --replace`
3. Move a window to the top left corner as quick as possible and then shake it
horizontally
4. Keep trying until it freezes (it usually does on the first or second try)

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