https://bugs.kde.org/show_bug.cgi?id=465424
Bug ID: 465424
Summary: Blank Screen on Attaching External Monitor
Classification: Plasma
Product: kwin
Version: 5.26.90
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-x11-standalone
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 156030
--> https://bugs.kde.org/attachment.cgi?id=156030&action=edit
Debug & Sysinfo
When I attach an external monitor to my laptop's HDMI port the monitor is
recognised but both the laptop and external screen go blank after a few
seconds, with only the mouse cursor functioning.
kwin_x11 is using 100% cpu and when i kill -9 it, kwin restarts and everything
works fine (until the HDMI cable is removed and re-inserted).
This is with Debian 12 (testing) on a Lenovo P1 with Intel/ Nvidia graphics
(nouveau driver). I believe the HDMI ports are hard-wired to the discrete GPU.
I installed the Nvidia driver and updated to version 5.26.90. The behaviour is
similar, except it will function properly until after a reboot.
I did try Wayland and nothing happens when attaching the monitor.
Attached is a debug file and system information (Nouveau & V5.26.4).
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian 12
KDE Plasma Version: 5.26.90
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8
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