https://bugs.kde.org/show_bug.cgi?id=400115
Bug ID: 400115
Summary: KScreen refresh rate settings applies after KWin
starts
Product: KScreen
Version: 5.14.1
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I have 75 Hz monitor, only one, but default refresh rate provided by EDID is 60
Hz. If I choose 75 Hz refresh rate in KScreen, apply it and save, then after
reboot and starting clean plasma session I have 75 Hz refresh rate due to
xrandr but 60 FPS in KWin due to qdbus org.kde.KWin /KWin supportInformation.
As result, animation is choppy and laggy.
If I run kwin --replace KWin restarts at 75 FPS and everything become smooth.
As a workaround, I need to have file in /etc/X11/Xsession.d/ with command
"xrandr --output DisplayPort-0 --mode 0x5a;" that sets monitor to 1080p@75Hz.
Command in file is executed by SDDM on startup before KWin starts so KWin reads
right xrandr options and starts at 75 FPS.
I think, KScreen must set xrandr options on plasma session startup strictly
before KWin starts.
SOFTWARE VERSIONS
KDE Plasma Version: 5.14.1
KDE Frameworks Version: 5.51.0
Qt Version: 5.11.2
X.org Version: 1.19.6
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