https://bugs.kde.org/show_bug.cgi?id=475797
Bug ID: 475797
Summary: Unable to change resolution of primary monitor to
1440p
Classification: Plasma
Product: kwin
Version: 5.27.8
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: christopher-h...@protonmail.com
Target Milestone: ---
SUMMARY
I am using 3 monitors connected to my ThinkPad T495 via a Lenovo ThinkPad Dock.
Two of them are DELL U2414H 1080p monitors connected via mini display port. The
primary monitor is a Samsung C34J79x ultra wide 1440p monitor connected via
HDMI.
The Samsung monitor is new and is the one giving me troubles. After it got
detected it defaulted to 1080p resolution. I tried to change that via the
Display Configuration however it said it changed it but the picture still was
in 1080p. Reopening Display Configuration confirmed this.
I tried setting the resolution manually using `kscreen-doctor` but to no avail.
I tried like this:
```
kscreen-doctor output.DP-3.mode.3440x1440@60
```
Rebooting a dozen times and trying again using both methods now brought me up
to a 2560x1080p@60hz resolution, reported by `kscreen-doctor`. However, no
further changes are possible.
STEPS TO REPRODUCE
1. Connect all three monitors to the Lenovo Dock.
2. Boot the system and try to change the resolution for the 1440p display to
1440p using either kscreen-doctor or the Display Settings application.
3. Close the Display Settings window and wait for changes
4. Re-open the Display Settings window and see that the change was not saved.
OBSERVED RESULT
The 1440p's display resolution was not set correctly. the display is stuck at
1080p and the image is blurry and stretched.
EXPECTED RESULT
I expected the resolution to be changed correctly.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Tumbleweed
(available in About System)
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.11
Session: Wayland
ADDITIONAL INFORMATION
Neofetch does report a resolution of 3440x1440, however I believe that is the
maximum possible resolution, not any set resolution.
kscreen-doctor output:
```
Output: 1 eDP-1 disabled connected priority 0 Panel Modes: 0:1920x1080@60*!
1:1680x1050@60 2:1280x1024@60 3:1440x900@60 4:1280x800@60 5:1280x720@60
6:1024x768@60 7:800x600@60 8:640x480@60 9:1280x1024@60 10:1024x768@60
11:1280x800@60 12:1920x1080@60 13:1600x900@60 14:1368x768@60 15:1280x720@60
Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable
RgbRange: unknown
Output: 2 DP-3 enabled connected priority 1 DisplayPort Modes: 0:3440x1440@60!
1:3440x1440@100 2:3440x1440@50 3:2560x1440@60 4:2560x1080@60* 5:2560x1080@60
6:2560x1080@60 7:1920x1080@60 8:1920x1080@60 9:1920x1080@60 10:1920x1080@50
11:1680x1050@60 12:1600x900@60 13:1280x1024@75 14:1280x1024@60 15:1440x900@60
16:1280x800@60 17:1152x864@75 18:1280x720@60 19:1280x720@60 20:1280x720@60
21:1280x720@50 22:1024x768@75 23:1024x768@70 24:1024x768@60 25:832x624@75
26:800x600@75 27:800x600@72 28:800x600@60 29:800x600@56 30:720x576@50
31:720x480@60 32:720x480@60 33:640x480@75 34:640x480@73 35:640x480@67
36:640x480@60 37:640x480@60 38:720x400@70 39:1600x1200@60 40:1280x1024@60
41:1024x768@60 42:1920x1200@60 43:1280x800@60 44:2560x1440@60 45:1920x1080@60
46:1600x900@60 47:1368x768@60 48:1280x720@60 Geometry: 1080,285 2560x1080
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown
Output: 3 DP-4 enabled connected priority 2 DisplayPort Modes: 0:1920x1080@60*!
1:1920x1080@60 2:1920x1080@60 3:1920x1080@50 4:1600x1200@60 5:1600x900@60
6:1280x1024@75 7:1280x1024@60 8:1152x864@75 9:1280x720@60 10:1280x720@60
11:1280x720@60 12:1280x720@50 13:1024x768@75 14:1024x768@60 15:800x600@75
16:800x600@60 17:720x576@50 18:720x480@60 19:720x480@60 20:720x480@60
21:720x480@60 22:720x480@60 23:640x480@75 24:640x480@60 25:640x480@60
26:640x480@60 27:720x400@70 28:1280x1024@60 29:1024x768@60 30:1280x800@60
31:1920x1080@60 32:1600x900@60 33:1368x768@60 34:1280x720@60 Geometry: 3640,0
1080x1920 Scale: 1 Rotation: 8 Overscan: 0 Vrr: incapable RgbRange: unknown
Output: 4 DP-5 enabled connected priority 3 DisplayPort Modes: 0:1920x1080@60*!
1:1920x1080@60 2:1920x1080@60 3:1920x1080@50 4:1600x1200@60 5:1600x900@60
6:1280x1024@75 7:1280x1024@60 8:1152x864@75 9:1280x720@60 10:1280x720@60
11:1280x720@60 12:1280x720@50 13:1024x768@75 14:1024x768@60 15:800x600@75
16:800x600@60 17:720x576@50 18:720x480@60 19:720x480@60 20:720x480@60
21:720x480@60 22:720x480@60 23:640x480@75 24:640x480@60 25:640x480@60
26:640x480@60 27:720x400@70 28:1280x1024@60 29:1024x768@60 30:1280x800@60
31:1920x1080@60 32:1600x900@60 33:1368x768@60 34:1280x720@60 Geometry: 0,0
1080x1920 Scale: 1 Rotation: 2 Overscan: 0 Vrr: incapable RgbRange: unknown
```
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