https://bugs.kde.org/show_bug.cgi?id=431057
Bug ID: 431057
Summary: Refresh rate values in Display Configuration menu are
always incorrect
Product: KScreen
Version: 5.20.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Plasma Applet
Assignee: kscreen-bugs-n...@kde.org
Reporter: valdi...@gmail.com
Target Milestone: ---
Display Configuration menu in System Settings shows either none or incorrect
refresh rates for some display resolutions.
I have two display configurations and it's not possible to switch both
resolution and refresh rate to correct values in one go. Display Configuration
would change the resolution but refresh rate is incorrectly displayed in the
drop-down menu.
I have to switch resolution first, then leave and open Display Configuration
again, only after this it shows correct refresh rates (but also only for
current resolution).
I have custom modelines for this monitor, but the bug also present without any
customizations.
DP-2 connected primary 1920x1080+1366+0 (normal left inverted right x axis y
axis) 527mm x 296mm
3840x2160_40.00_rb1 39.98
3840x2160_30.00_rb1 29.98
3840x2160 29.98
3200x1800_57.00_rb1 56.98
3200x1800_50.00_rb1 49.98
3072x1728_60.00_rb1 59.99
2560x1440 59.95
1920x1200 59.88
1920x1080 60.00* 60.00 50.00 59.94 24.00 23.98
1920x1080i 60.00 50.00 59.94
…
STEPS TO REPRODUCE
For example, I want to switch from 1920×1080@60Hz to 3840×2160@39.98Hz (custom
profile).
1. Open Display Configuration, select the display, choose 3840×2160 resolution
2. Refresh rate in the drop-down menu is automatically set to 50 Hz.
3. Open Refresh rate drop-down menu, see 60/50/30/25/24 Hz options (only 30 Hz
could be seen in xrandr for this resolution)
4. Choose any refresh rate (or leave 50 Hz), press apply button. The resolution
is changed, the refresh rate is random.
5. Leave Display Configuration, enter it again, select the display
6. Refresh rate drop-down menu now has 40/30 Hz, as it should be.
OBSERVED RESULT
Refresh rate drop-down menu shows incorrect rates for all resolutions except
current.
EXPECTED RESULT
Refresh rate drop-down menu should show correct set of rates for all
resolutions, as it shown in xrandr.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 33
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.2
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