https://bugs.kde.org/show_bug.cgi?id=495289
Bug ID: 495289
Summary: after sleep, brightness of external monitor is not
restored correctly
Classification: Plasma
Product: plasmashell
Version: 6.2.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
Let my laptop sleep overnight, after logging in to an existing plasma session,
the external (DP) monitor is way too dark.
The only workaround is to log-off and log on again.
(fiddling with tools does not help)
My setup:
power-management: display & brightness: dim automatically: never
(interesting side-effect: changing the screen-brightness slider only affects
the laptop built-in screen, not the external monitor)
My utility-script helps in setting the (for me) suitable config:
ddcutil --display 1 setvcp 0x10 30
brightnessctl -d 'amdgpu_bl1' set 20%
This does not help to regain intial brightness after wakeup, though
`kscreen-doctor -o` confirms my setup
Output: 1 eDP-1
Brightness control: supported, set to 20%
Output: 2 DP-5
Brightness control: supported, set to 30%
...this remains true even after waking up from sleep, although the brightness
of the DP-connected monitor is too dark
These settings also correspond to the monitor-setup (hardware-keys). Asking my
monitor-OSD/menu confirms that brightness is indeed 30%
Fiddling with
sudo tee /sys/class/backlight/amdgpu_bl1/brightness <<< 52
obviously only affects the built-in laptop-monitor, not the DP one
For me, this looks like plasma is doing some other kind of darkening that i
cannot control on the commandline?
(any dbus commands that may help?)
Im prette fedup with the neccessity to logoff/login only to restore
screen-brightness.
Yes, i can grab the plasmoid-brightness slider and pull the DP brightness all
the way up to 80%, which then somehow matches my intended brightness.
This only helps temporarily, because logging off/on later remembers this
setting and the DP monitor is waaay to bright (so i need to fix this with the
ddcutil script above)
Something is not working correctly since plasma 6.2.0 (and still broken in
6.2.1 and 6.2.2)
any help is appreciated
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