https://bugs.kde.org/show_bug.cgi?id=420160
Bug ID: 420160
Summary: Session crashes when monitor goes into standby
Product: Powerdevil
Version: 5.18.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: sonichedgehog_hyperblas...@yahoo.com
Target Milestone: ---
The Wayland Plasma session crashes to the login manager when the screen is set
to power off. The monitor will first go into standby once the mouse hasn't been
moved for the given amount of minutes, but will immediately wake up afterward.
When it does I can briefly see the console, followed by the login screen from
which I need to log in again. This prevents being able to power off my screen
and preserve its lifetime as well as electricity consumption.
I discussed this on the openSUSE forum and someone pointed me to a bug from
Redhat which indicates Wayland crashes when no monitors are present. As mine is
connected over a DisplayPort cable which (alongside HDMI) no longer seems to
support classic standby mode, the display will become entirely disconnected; In
X11 it worked but when the screen came back online, the system detected a new
HDMI audio device as if it was just plugged in. Here's the bug mentioned,
unfortunately it seems to be unmaintained with no activity:
https://bugzilla.redhat.com/show_bug.cgi?id=1705121
Indeed this seems to be my issue too; I enabled my secondary display (a cheap
VR headset) then turned monitor standby back on. While the screens still didn't
stay in standby and apparently switched order, I didn't experience a session
crash this time.
I reported this to the Wayland but tracker first. Its developers stated it's
not a protocol issue and I should report this with KDE so I moved it here. I'm
assuming Powerdevil is the component responsible for managing display devices
under WL... if that's incorrect please set it to the proper product.
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