https://bugs.kde.org/show_bug.cgi?id=484492
Bug ID: 484492
Summary: Plasma Wayland fails to initialize Display Stream
Compression
Classification: Plasma
Product: kwin
Version: 6.0.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: parker.l.r...@gmail.com
Target Milestone: ---
SUMMARY
Hardware: Steam Deck/ROG Ally
Dock : Dell WD-19S
Monitors: 3 Lenovo Q27q-10 1440p 75 Hz
With all three monitors connected (MST and Display Stream Compression) Plasma
X11 can output to all three at their native 1440p 75 Hz.
When running Plasma Wayland, it's either
* 2 1440 75 Hz and the third monitor never initializes video (Does however show
up to KScreen)
* 1 1440 75 Hz and 2 1080 60 Hz (As if Display Stream Compression wasn't even
working to begin with)
I have confirmed on Gnome Wayland Mutter that all three monitors do work at
their native resolution for Wayland.
STEPS TO REPRODUCE
1. Plug in monitors
2. Go to Display Settings
3. Try to configure all three at native reosolution
OBSERVED RESULT
Acts like DSC isn't available and either 2 work or 3 work at reduced
resolution.
EXPECTED RESULT
All three to work at native resolution (As they do in Gnome)
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 24.0.2
Qt Version: 6.6.2
ADDITIONAL INFORMATION
Dmesg from ROG Ally
https://gist.github.com/parkerlreed/10da3f1ff55340c5b1f317948ee8f7ac
Journalctl (kernel + plasma) from Steam Deck
https://gist.github.com/parkerlreed/0b153848d2513d0ad7d8d8696aeffe2f
amdgpu thread https://gitlab.freedesktop.org/drm/amd/-/issues/3278
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