https://bugs.kde.org/show_bug.cgi?id=459038
Bug ID: 459038
Summary: When the active KDE session loses the HDMI signal, it
is no longer possible to re-enter it, having to reboot
the machine or opening another console session with
Ctrl + (F1, F2, F3...)
Product: KScreen
Version: 5.25.5
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: critical
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: rondo...@gmail.com
Target Milestone: ---
SUMMARY
***
After installing the latest KDE updates (I work with the unstable branch of
Manjaro), when the active KDE session loses the HDMI signal, either because the
session is switched by pressing Ctrl + (F1, F2, F3...), the monitor enters
standby mode or because the signal is changed with a KVM switch, it is
completely impossible to be able to recover the KDE session again, when it
receives the HDMI signal again when changing back to the session by pressing
Ctrl + (F1, F2, F3...), when leaving the monitor from standby or changing the
signal to the computer with Linux on the KVM switch, the screen stays
completely black and does not show the unlock screen, forcing you to open
another console session with Ctrl + (F1, F2, F3...) to open another KDE session
or directly being forced to restart the machine.
Please, this error is serious, I can't work this way, every time the monitor
goes into standby mode because I get up to have a coffee or do something, when
I come back I am forced to restart the machine, losing all my work that I have
open.
***
STEPS TO REPRODUCE
1. Switch to another console by pressing Ctrl + (F1, F2, F3...), waiting for
the monitor to standby mode or switch to another machine via a KVM switch,
anything that causes the current KDE session to lose HDMI signal
2. Trying to go back to the previous KDE session by pressing Ctrl + (F1, F2,
F3...), moving the mouse to bring the monitor out of standby mode, or switching
to the previous Linux machine via a KVM switch, anything that wakes up the HDMI
signal in the previous KDE session.
OBSERVED RESULT
Then you will see that the KDE session does not react and the screen remains
completely black, not being able to enter it again and being forced to restart
the machine or open another console by pressing Ctrl + (F1, F2, F3...).
EXPECTED RESULT
Prior to installing the latest KDE updates, it would display the unlock screen
without issue and allow you to re-login to KDE.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro KDE Plasma working with unstable branch
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.6
ADDITIONAL INFORMATION
Tested with kernels 5.19.8-1 and 6.0.0rc5-1
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