https://bugs.kde.org/show_bug.cgi?id=511490
Bug ID: 511490
Summary: External monitor receives no input and causes laptop
screen to freeze
Classification: Plasma
Product: kwin
Version First 6.5.1
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
On my Thinkpad X1 Carbon 6th Gen., running KDE Plasma 6.5.1, after connecting
an external monitor to the laptop, there is not video output to the external
monitor, and the laptop screen freezes. After disconnecting the external
monitor, the laptop screen then shows any activity you do (moving mouse,
clicking on things).
Essentially if you boot with an external monitor connected, you see a blank
screen on both the external monitor and the laptop screen before it even gets
to the login manager (SDDM). At that point unplugging the external monitor
shows SDDM on the laptop screen.
If you login and plug the external monitor in again, it gets no video output
and the laptop screen completely freezes till you unplug it again.
This issue occurred after the dnf upgrade from KDE Plasma 6.4.5 to 6.5.1 today
on Fedora 43. It worked fine before that. I've tried connecting the monitor
with both USB-C and HDMI (directly to the laptop). All output is shown during
the Grub boot and in multi-user mode. Running "startplasma" in multi-user mode
also then causes this.
STEPS TO REPRODUCE
1. Start KDE 6.5.1 with an external monitor connected with either USB-C or
HDMI. Make sure the monitor is turned on and set to the correct input source.
2. Right when plasma would bring up SDDM, both the external monitor and laptop
screen are blank.
3. Unplugging the external monitor brings up SDDM.
4. Log in on the laptop screen.
5. Plug in the monitor again.
6. You should see the external monitor not get video input, and the laptop
screen won't reflect any mouse movements or typing.
7. Unplug the external monitor, and the laptop screen will no longer be
"frozen".
OBSERVED RESULT
Cannot use an external monitor connected to a laptop with neither USB-C, nor
HDMI. Trying to do so causes the laptop screen to freeze.
EXPECTED RESULT
I should be able to connect an external monitor.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.5.1
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
ADDITIONAL INFORMATION
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