https://bugs.kde.org/show_bug.cgi?id=376684
Bug ID: 376684
Summary: Screen brightness can not be changed after external
monitor was connected
Product: plasmashell
Version: 5.8.3
Platform: openSUSE RPMs
OS: Linux
Status: UNCONFIRMED
Severity: minor
Priority: NOR
Component: Battery Monitor
Assignee: k...@privat.broulik.de
Reporter: matthias.wi...@gmx.net
CC: plasma-b...@kde.org
Target Milestone: 1.0
Hello,
on my laptop (Thinkpad X240) the screen brightness can be changed by Fn+F and
via the battery context menu when the battery icon in the task bar is selected.
Both ways work fine.
Actual Results:
When an external monitor has been connected (primary monitor) and disconnected
again, the screen brightness can not be changed anymore. After a reboot
everything works again.
The screen brightness can still be changed when changing the values in
/sys/class/backlight/intel_backlight/brightness but not via Fn+F or via battery
context menu. So it seems that for some reason, the /sys/class/.../brightness
is not changed anymore once an external monitor was connected and disconnected
again.
Expected Result:
After disconnecting the external monitor the screen brightness should be
changeable.
Output of journalctl does not give obvious errors just messages like this:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
kscreen.xcb.helper: Output: 67
kscreen.xcb.helper: Property: Backlight
kscreen.xcb.helper: State (newValue, Deleted): 0
Above messages appear in both cases: screen brightness is changeable or is not
changeable.
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