https://bugs.kde.org/show_bug.cgi?id=459929
Bug ID: 459929
Summary: USB-C connected display goes black when mouse is moved
from laptop display
Classification: Plasma
Product: kwin
Version: 5.25.5
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: si...@ergotech.com
Target Milestone: ---
Created attachment 152551
--> https://bugs.kde.org/attachment.cgi?id=152551&action=edit
dmesg with drm debugging
SUMMARY
After commit f07d6bd40034372b7176f57de080003c8a612d57, when I move my mouse
from my laptop display to my externally-connected HDMI display, the second
display goes black. If I have the Display Configuration open, it says that a
devices has been removed and it needs to refresh.
This video shows what I am experiencing: https://youtu.be/ncIfA-Q5Mxw
Oddly, I am not able to reproduce this with just kwin_wayland running in a TTY.
STEPS TO REPRODUCE
1. Log in to plasma Wayland with any build containing
f07d6bd40034372b7176f57de080003c8a612d57
2. Move mouse from primary display onto USB-C connected HDMI display
3.
OBSERVED RESULT
Display "disconnects".
EXPECTED RESULT
Mouse moves smoothly from one display to the next.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.19.8-200.fc36.x86_64
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
ADDITIONAL INFORMATION
This is a dual GPU setup, with the laptop's internal display connected to an
AMD 680M and the HDMI display connected over USB-C (evdi driver).
Attached file contains the DRM logs, collected as described here:
https://invent.kde.org/plasma/kwin/-/wikis/Debugging-DRM-issues
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