Bug 481554

Summary: Wayland + Nvidia - Extreme stuttering doing anything
Product: [Plasma] kwin Reporter: Ashcon Mohseninia <ashcon50>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: xaver.hugl
Priority: NOR Keywords: qt6
Version First Reported In: 5.93.0   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Ashcon Mohseninia 2024-02-19 20:44:13 UTC 
SUMMARY
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On a hybrid setup (External monitors connected to NVIDIA GPU, laptop display connected to internal intel GPU), there is extreme stuttering of the UI, GLXGears will run at 1/2 the refresh rate of the displays.
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(Note, on plasma 5.x, using `KWIN_DRM_USE_MODIFIERS=0` would resolve this issue, but in 6.x, either this env. variable is ignored, or does nothing)

I've attached a video showing this issue, both my external monitors are 120Hz, and the laptops own display is 144Hz, so theoretically, the minimum framerate I should get is 120Hz, but, you can see when doing anything like moving windows around, the glxgear window stutters and framerate drops significantly1.


SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.7.0
Comment 1 Zamundaaa 2024-02-19 23:25:24 UTC 
This is a bug in the NVidia driver, and will only be resolved with a future driver release

*** This bug has been marked as a duplicate of bug 452219 ***