https://bugs.kde.org/show_bug.cgi?id=488982
Bug ID: 488982
Summary: [Presentation Time] Having proprietary NVIDIA drivers
loaded breaks Chromium Vsync on wayland.
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: o.rootedavi...@gmail.com
Target Milestone: ---
SUMMARY
I have a laptop system with AMD Ryzen integrated graphics running Kwin, and a
dedicated NVIDIA GPU I use with PRIME to run games.
Having the nvidia proprietary drivers loaded, despite Kwin running on my AMD
integrated GPU, breaks Chromium's ability to vsync to my 240Hz screen. It
vsyncs correctly to my 120Hz laptop screen, but not my 240Hz one.
STEPS TO REPRODUCE
0. Use hybrid system with AMD Integrated graphics running Kwin, with NVIDIA
dedicated graphics on the side.
0. Alternatively, try this with a fully-NVIDIA system (I'm not sure if the
issue is also present in this case. I don't have such a system)
1. Make sure nvidia drivers are loaded and system is connected to a 240Hz
screen (and a lower refresh rate one? I'm also unsure if this bug happens only
with multiple-monitor setups)
2. Launch Chromium with --ozone-platform-hint=auto
3. Go to https://vsynctester.com
OBSERVED RESULT
Chromium fails to vsync (spiky frametime graph), framerate hovers at ~160-190
EXPECTED RESULT
Chromium vsyncs to 240Hz. Smooth and stable frametime graph
SOFTWARE/OS VERSIONS
Operating System: EndeavourOS
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
Kernel Version: 6.9.5-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 4800H with Radeon Graphics
Memory: 15,0 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: ASUS TUF Gaming A17 FA706IU_FA706IU
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