https://bugs.kde.org/show_bug.cgi?id=521949
Bug ID: 521949
Summary: Issues with using a monitor through DisplayPort Alt
Mode
Classification: Plasma
Product: KScreen
Version First 6.7.0
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 193502
--> https://bugs.kde.org/attachment.cgi?id=193502&action=edit
Broken display settings
STEPS TO REPRODUCE (case 1)
1. plug in dock and monitor
2. start a plasma wayland session
OBSERVED RESULT (case 1)
KDE Plasma will not visibly start
STEPS TO REPRODUCE (case 2)
1. start a plasma wayland session
2.plug in dock and monitor
OBSERVED RESULT (case 2)
Plasma will freeze or become extremely laggy until unplugged from the dock.
Additionally, I found a way to get plasma to be usable on the built in display
while in this broken state is to be in a TTY while plugging in the dock and
then moving back to plasma:
A screenshot of display settings and the error it displays while in this state
is attached, you are also unable to press Apply
running `kscreen-doctor output.DP-3.enable` returns this cryptic error:
❯ kscreen-doctor output.DP-3.enable
Enabling output 1
applying config failed! DP-3 cannot mirror itself
additionally, here is the output of `kscreen-doctor -o` in this broken state:
Output: 1 DP-3
disabled
connected
priority 0
DisplayPort
replication source:1
Modes: 1:[email protected]*! 2:[email protected] 3:[email protected]
4:[email protected] 5:[email protected] 6:[email protected] 7:[email protected]
8:[email protected] 9:[email protected]
Custom modes: None
Geometry: 0,0 3440x1440
Scale: 1
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: Automatic
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Color profile source: sRGB
Color power preference: prefer efficiency and performance
Brightness control: supported, set to 100% and dimming to 100%
Color resolution: automatic (10), range: [6; 12] bits per color
Allow EDR: unsupported
Sharpness control: unsupported
Automatic brightness: supported, disabled
Auto Rotate Policy: incapable
Adaptive backlight modulation: unsupported
Output: 2 eDP-1 f4cc8fd6-a076-408d-85ac-412bd72936ed
enabled
connected
priority 1
Panel
replication source:1
Modes: 10:[email protected]*! 11:[email protected] 12:[email protected]
13:[email protected] 14:[email protected] 15:[email protected] 16:[email protected]
17:[email protected] 18:[email protected] 19:[email protected] 20:[email protected]
21:[email protected]
Custom modes: None
Geometry: 0,0 1564x1043
Scale: 1.75
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: Automatic
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Color profile source: sRGB
Color power preference: prefer efficiency and performance
Brightness control: supported, set to 30% and dimming to 100%
Color resolution: automatic (10), range: [6; 12] bits per color
Allow EDR: always
Sharpness control: unsupported
Automatic brightness: supported, disabled
Auto Rotate Policy: inTabletMode
Adaptive backlight modulation: unsupported
SOFTWARE/OS VERSIONS
Operating System: CachyOS
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
ADDITIONAL INFORMATION
This bug only occurs on Wayland, X11 works fine
SDDM works fine as well and displays on both monitors
Dock: Dell WD22TB4 using USB-C instead of Thunderbolt
Display: Alienware AW3418DW
Laptop: Surface Pro 7 (standard cachyos kernel, not linux-surface)
--
You are receiving this mail because:
You are watching all bug changes.
