https://bugs.kde.org/show_bug.cgi?id=431066
Bug ID: 431066
Summary: kscreen reports doublescan modes at double refresh
rate (e.g. 120hz mode on 60hz screen)
Product: KScreen
Version: 5.20.4
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libkscreen
Assignee: kscreen-bugs-n...@kde.org
Reporter: and...@xortux.com
Target Milestone: ---
SUMMARY
KScreen shows a 120hz refresh rate mode on my laptop screen even though it only
supports 60hz. xrandr lists the "120hz" modes as 60hz and DoubleScan.
Similar bug in gnome: https://gitlab.gnome.org/GNOME/mutter/-/issues/275
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
$ xrandr --verbose
1920x1080 (0x48) 138.700MHz +HSync -VSync *current +preferred
h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 66.68KHz
v: height 1080 start 1083 end 1088 total 1111 clock 60.02Hz
1920x1080 (0x49) 356.375MHz -HSync +VSync DoubleScan
h: width 1920 start 2080 end 2288 total 2656 skew 0 clock 134.18KHz
v: height 1080 start 1081 end 1084 total 1118 clock 60.01Hz
1920x1080 (0x4a) 266.500MHz +HSync -VSync DoubleScan
h: width 1920 start 1944 end 1960 total 2000 skew 0 clock 133.25KHz
v: height 1080 start 1081 end 1084 total 1111 clock 59.97Hz
1920x1080 (0x4b) 173.000MHz -HSync +VSync
h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.16KHz
v: height 1080 start 1083 end 1088 total 1120 clock 59.96Hz
1920x1080 (0x4c) 138.500MHz +HSync -VSync
h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 66.59KHz
v: height 1080 start 1083 end 1088 total 1111 clock 59.93Hz
$ kscreen-console output
Modes:
"72" "" QSize(1920, 1080) 60.0204
"73" "" QSize(1920, 1080) 120.016
"74" "" QSize(1920, 1080) 119.937
"75" "" QSize(1920, 1080) 59.9628
"76" "" QSize(1920, 1080) 59.9339
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