https://bugs.kde.org/show_bug.cgi?id=505451
Bug ID: 505451
Summary: Tearing not occurring on certain/newer Kernel versions
Classification: Plasma
Product: kwin
Version First 6.3.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: thederpywo...@gmail.com
Target Milestone: ---
SUMMARY
Having tearing enabled for all monitors, and forcing tearing on a fullscreen
application (eg. using window rules) does not result in tearing in certain
Linux kernel versions. In this case, I've tested it with osu!lazer.
To go in a bit deeper - I've also tested the "Show Paint" effect, and see how
that differs.
STEPS TO REPRODUCE
1. Have a certain version of Linux kernel
2. Enable tearing on the display, and force it using Window Rules if necessary
3. Observe that tearing appears only in older versions
OBSERVED RESULT
| >>6.14.7.zen2-1
| Tearing WORKS, "Show Paint" shows stripes of differing colors
kwin_wayland[1831]: kwin_wayland_drm: Atomic test failed! Invalid argument
kwin_wayland[1831]: kwin_core: Changed presentation mode to
KWin::PresentationMode::VSync
kwin_wayland[1831]: kwin_core: Changed presentation mode to
KWin::PresentationMode::Async
| >>6.14.10.zen1-1
| Tearing WORKS, however enabling "Show Paint" makes it Vsync/Tear-free
kwin_wayland[2007]: kwin_wayland_drm: Atomic test failed! Invalid argument
kwin_wayland[2007]: kwin_core: Changed presentation mode to
KWin::PresentationMode::VSync
kwin_wayland[2007]: kwin_core: Changed presentation mode to
KWin::PresentationMode::Async
| >>6.15.1.zen1-2
| Tearing DOES NOT WORK at all, Show Paint shows no-tearing
kwin_wayland[1823]: kwin_wayland_drm: Atomic test failed! Invalid argument
kwin_wayland[1823]: kwin_wayland_drm: Atomic test failed! Invalid argument
kwin_wayland[1823]: kwin_wayland_drm: Atomic test failed! Invalid argument
*these lines are constantly being repeated as osu! is running*
EXPECTED RESULT
In all three Kernel versions, tearing should be present as it is requested --
additionally Show Paint should also observe tearing? Although not sure if that
was just a happy accident.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.1
Kernel Version: 6.14.7-zen2-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 6800HS with Radeon Graphics
Memory: 14.9 GiB of RAM
Graphics Processor 1: AMD Radeon 680M
ADDITIONAL INFORMATION
--
You are receiving this mail because:
You are watching all bug changes.
