https://bugs.kde.org/show_bug.cgi?id=453392
Bug ID: 453392
Summary: KScreen doesn't show the correct matrix of resolution
vs frequency
Product: KScreen
Version: 5.24.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: sa...@afach.de
Target Milestone: ---
Created attachment 148559
--> https://bugs.kde.org/attachment.cgi?id=148559&action=edit
Zip file containing two screenshots showing wrong/impossible refresh rates +
resolution combination
SUMMARY
xrandr reports wrong modes for 4K my laptop screen. The following is the
result:
```
eDP-1 connected (normal left inverted right x axis y axis)
15360x8640 15.83 28.85
7680x4320 15.83 59.99 59.99 59.99
5120x2880 59.99 59.99
4096x2304 59.99 59.98
3840x2160 60.00 60.01 59.98 59.97
3200x1800 59.96 59.94
2880x1620 59.96 59.97
2560x1600 59.99 59.97
2560x1440 59.99 59.99 59.96 59.95
2048x1536 60.00
1920x1440 60.00
1856x1392 60.01
1792x1344 60.01
2048x1152 59.99 59.98 59.90 59.91
1920x1200 59.88 59.95
1920x1080 60.01 59.97 59.96 59.93
1600x1200 60.00
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 60.00
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 60.06
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
```
The resolutions related to 16K and 8K are not feasible. But they, nevertheless,
get displayed for some reason. KScreen doesn't seem to be aware of the matrix
of possible resolutions vs frequencies. For the highest resolution, 15360x8640,
has possible frequencies are 29 Hz and 16 Hz. And these are the only possible
options shown, no matter what resolution I choose. See the screenshot attached.
This practically just means that the laptop screen never works unless I
restart, and at times delete everything all kscreen data (the json files) so
that everything can be refreshed. Meaning, once I disconnected my docking
station, I just have to restart the computer. Otherwise the laptop screen
doesn't work.
I tried modifying the json files of kscreen, but it doesn't help. Frankly I
don't understand when they're loaded.
STEPS TO REPRODUCE
1. Have bad resolutions in your screen
2. Disconnect that screen (close the lid of the laptop of that screen)
3. Restart
4. Try to get that screen working again
OBSERVED RESULT
See attached file. There's no way to get a viable resolution + refresh rate
after getting wrong frequencies because if the wrong 16K value.
EXPECTED RESULT
All possible frequencies should be shown, not just the ones from the first
entry of xrandr, and an error should be presented if the selected frequency
doesn't match the resolution. OR, when changing the content of the selected
item in the Resolution drop down menu, the Refresh rate should change to the
viable options for this mode.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 22.04 LTS
(available in About System)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
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