https://bugs.kde.org/show_bug.cgi?id=500166
Bug ID: 500166
Summary: Tearing not working on Wayland
Classification: Plasma
Product: kwin
Version: 6.3.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
So, I been testing to get tearing working, I have enabled
QT_LOGGING_RULES="kwin_core.debug=true" to get the tearing log, but I am don't
get anything if VRR is on I get
Feb 16 02:16:00 syntist-pc kwin_wayland[1747]: kwin_core: Changed presentation
mode to KWin::PresentationMode::VSync
Feb 16 02:16:01 syntist-pc kwin_wayland[1747]: kwin_core: Changed presentation
mode to KWin::PresentationMode::AdaptiveSync
Feb 16 02:22:55 syntist-pc kwin_wayland[1747]: kwin_core: Changed presentation
mode to KWin::PresentationMode::VSync
And when i disabled vrr, I don't get any output.
I have tried Wayland + Vulkan, Xwayland + DXVK, xwayland + vulkan with Intel
GPU (IGPU) and Nvidia GPU (DGPU)
I also make sure show compositing effect is not showing meaning the app is
running in direct scannout. I don't see any tearing either.
STEPS TO REPRODUCE
1. Turn on allow tearing and kwin_core log
QT_LOGGING_RULES="kwin_core.debug=true"
2. Run the game in full screen (direct scannout mode + immediate vulkan)
3. journalctl -f | grep 'Changed presentation mode'
OBSERVED RESULT
Mode is never changed to tearing.
EXPECTED RESULT
Mode should change to tearing
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.13.2-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i7-12800H
Memory: 15.3 GiB of RAM
Graphics Processor 1: Intel® Iris® Xe Graphics
Graphics Processor 2: NVIDIA RTX A1000 Laptop GPU
ADDITIONAL INFORMATION
It was working when we were testing the ticket, but after it never worked for
me.
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