https://bugs.kde.org/show_bug.cgi?id=508986
Bug ID: 508986
Summary: SDDM and kwayland issue
Classification: Frameworks and Libraries
Product: kwayland
Version First unspecified
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Created attachment 184615
--> https://bugs.kde.org/attachment.cgi?id=184615&action=edit
journalctl
SUMMARY
I have a Fedora 42 Laptop Lenovo L14 Gen 5 with a Ryzen 7735u CPU, and a Dell
Type C Docking Station which uses MST to allow you plug in extra monitors.
During boot with the kernel initramfs I can see display output on my 2 external
monitors provided by the Dell Dock, when I get to SDDM the monitors stop
working (no signal) and I get errors in the journal. If I unplug my laptop from
the dock, I can then login using the laptop screen, once I hit the KDE desktop,
I can then plug the dock back in and the screens work no problem, had no
tearing, lag or video play back issues.
I'm not sure if the issue is SDDM or kwayland, I assumed kwayland since it's
doing the actual displaying part of it, and kwin_wayland_drm is doing most of
the complaining.
STEPS TO REPRODUCE
1. Install Fedora 42 and fully update the system
2. Connect to a docking station which uses MST to provide multiple monitors
over one Type C cable. Not to be mistaken with DisplayLink based docks. Dell
WD19 for example.
3. Reboot
4. External screen(s) work during initramfs, but soon as you hit SDDM they turn
off.
OBSERVED RESULT
Monitors turn off and won't come on. I've tried different situations to workout
where the problem is, soon as I use a display that uses Displayport MST, the
problem happens, directly using HDMI or even a DisplayLink dock the problem
doesn't happen.
I've tried two monitors and single monitors through the Dock.
If I SSH the laptop while it's in the broken state, I can see in /sys/ the
monitors are there with a status of connected.
EXPECTED RESULT
Screen to function as normal, as they do in the wayland desktop.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
Kernel Version: 6.16.3-200.fc42.x86_64 (64-bit)
ADDITIONAL INFORMATION
Please see attachment for logs.
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