https://bugs.kde.org/show_bug.cgi?id=506359
Bug ID: 506359
Summary: after overnight screen lock, no outputs or inputs
after turning on display
Classification: Plasma
Product: kwin
Version First 6.3.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
My setup has a gpu with a single 4k output screen (LG TV) via HDMI 2.1. At
night I lock the session and turn off the screen. In the morning, when I turn
on the TV again, usually it says no signal. A partial workaround seems to be
Ctrl+Alt+F2 then Ctrl+Alt+F1. But in addition sometimes after this I have no
keyboard/mouse input. The TV sees the signal that is my black desktop
background, but mouse/keyboard does nothing. So if I go and unplug/replug my
USB inputs, I hear the disconnect sound and reconnect sound from plasma, and
then the inputs work.
STEPS TO REPRODUCE
1. Lock screen and turn off monitor at night
2. In the morning turn on the screen and note if it says "no signal"
3. Perform Ctrl+Alt+F2 and then Ctrl+Alt+F1. Note if there is now a signal
4. Try to use mouse and keyboard to unlock the session. Note if there is no
keyboard/mouse input
5. Unplug USB input devices. Note if there is a disconnect sound played by
plasma.
6. Re-plug USB input devices. Note if there is a connect sound played by
plasma.
7. Try logging in now
OBSERVED RESULT
- no signal when turning on the screen
- get a signal after changing virtual terminals
- at least half of the time, after this I can log in now
- (less than half the time) no keyboard/mouse input after changing virtual
terminals back to plasma
- hear the disconnect/reconnect sounds
- mouse and keyboard work after disconnect/reconnect and I can unlock the
session
When I lock my screen and turn it off at night, the journal shows many apps
logging messages like
- qt.qpa.wayland: There are no outputs - creating placeholder screen
- qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
In the morning I also see the same messages (not sure if before or after
switching virtual terminals,
but I see them e.g. 37 seconds before I unplugged USBs or the first kernel USB
disconnect messages).
EXPECTED RESULT
- Ctrl+Alt+F2 and Ctrl+Alt+F1 ideally would not be required for the TV to
detect an HDMI signal
- Mouse/keyboard should not be blocked. They definitely work otherwise per the
virtual terminal change and even have the plasma disconnect sound.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch linux 6.15.2-arch-1
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
ADDITIONAL INFORMATION
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