https://bugs.kde.org/show_bug.cgi?id=468235
Bug ID: 468235
Summary: Screen refresh rate stuck at 60hz even when set to
144hz in the display settings
Classification: Plasma
Product: kwin
Version: 5.27.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: leguen.yann...@gmail.com
Target Milestone: ---
SUMMARY
***
My display comes with 4 different refresh rates: 60hz, 120hz, 144hz and 165hz.
Since kwin 5.27.4, the screen refresh rate is stuck at 60hz whether I select
60hz, 120hz or 144hz from the Plasma display settings (confirmed by checking
the screen OSD menu). It happens on both Wayland and X11 sessions.
xrandr displays the selected refresh rate.
Setting the refresh rate to 165hz works as intended though.
Downgrading to kwin 5.27.3 solves the issue.
***
STEPS TO REPRODUCE
1. Select a 120hz or 144hz refresh rate from Plasma display settings
2. Moving the mouse cursor / windows around seems sluggish
3. The screen OSD confirms that it's still running at 60hz
SOFTWARE/OS VERSIONS
Linux: Arch Linux
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
My display is an Iiyama G-Master GB2770QSU-B1
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