https://bugs.kde.org/show_bug.cgi?id=490845
Jakob Petsovits <jpe...@petsovits.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |WAITINGFORINFO
Status|REPORTED |NEEDSINFO
CC| |jpe...@petsovits.com
--- Comment #1 from Jakob Petsovits <jpe...@petsovits.com> ---
(In reply to Rafal from comment #0)
> Some sessions occur problem with changing screen brightness. First
> change(click on bar or scroll up/down on tray icon) works but then any
> attempts not working.
> In journal logs i can see:
> error setting brightness via dbus
> QDBusError("org.freedesktop.DBus.Error.UnknownObject", "No such object path
> '/org/kde/Solid/PowerManagement/Actions/BrightnessControl'")
Thanks for the report and screen recording. If the BrightnessControl D-Bus
interface is missing, I can think of two possible reasons:
(a) PowerDevil crashed, which is unfortunately something that happens in 6.1.2
and 6.1.3 when waking up from inactivity and will only be fixed with 6.1.4.
Have a look with `coredumpctl --reverse` to see if a powerdevil process
recently produced a coredump after a crash. That would be Bug 490356.
(b) ddcutil lost track of the monitor, so PowerDevil removed its brightness
controls and the applet didn't recognize the disappearance of the
BrightnessControl interface. That would be Bug 482713. Have a look with
`ddcutil detect` whether your monitor is still recognized by ddcutil at all -
it happened to me recently that this would stop working until a reboot.
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