https://bugs.kde.org/show_bug.cgi?id=512968

--- Comment #8 from [email protected] ---
Some additional debugging:

Still observe glitches when internal and external screen both set to 60Hz.
Adaptive sync setting for internal screen doesn't seem to change things (I
tried always, automatic, and never)

- only using nvidia dGPU through bias setting
  No glitches, but still crashes when `KWIN_DRM_NO_AMS=1`
- forcing sync
  Setting KWIN_DRM_FORCE_GL_FINISH_MGPU_COPY=1 and
KWIN_DRM_FORCE_GL_FINISH_PRESENT=1
  No glitches.
  When `KWIN_DRM_NO_AMS=1`, still crashes. Looking at backtrace, segfault on
same line (pageFlipHandler, handling defunct commits). Issue is commit->gpu()
is null.
- using Nouveau
  crashes, even when not setting `KWIN_DRM_NO_AMS=1`. In the backtrace,
commit->gpu() is null.
  This does not happen with the commit 03f77c reverted.
  I think this indicates that the issue is not with the nvidia proprietary
driver.
- with 03f77c reverted, and
https://invent.kde.org/plasma/kwin/-/merge_requests/7980 (commit
ad1eb9b215043fafb017a1a3a51790739930d6e0) applied
  No glitches, and no crashes when setting `KWIN_DRM_NO_AMS=1`

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