https://bugs.kde.org/show_bug.cgi?id=520486
Bug ID: 520486
Summary: Dark screen and brightness applet at 100% while
brightnessctl reports 30% after external monitor
unplugged during sleep
Classification: Plasma
Product: plasmashell
Version First 6.6.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
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DESCRIPTION
My laptop screen is reported at 100% brightness but it is not and very dark.
Cheking whith `brightnessctl`, the value is `148501`. The actual maximum value
is `495000`.
If I exec `brightnessctl set 100%`, the screen brightness is correctly
adjusted.
If I use the applet and move brightness down and back to 100%, then it comes
back to `148501`
This happened after I put my laptop in sleep while it was plugged to an
external monitor, and that external monitor was declared as the primary
monitor.
I unplugged the external monitor while sleeping, woke it up and I observed
screen being at 100% brightness, then getting darkner - I suppose when KDE
changed what was the primary monitor back to my laptop one.
STEPS TO REPRODUCE
1. connect to external monitor, set it as primary
2. put laptop into sleep
3. unplug external monitor
4. wake up laptop
OBSERVED RESULT
The laptop monitor get the unplugged external monitor as max brightness value
in brightness applet
EXPECTED RESULT
The max value is actually the one of the laptop, so that when the applet is at
"100%", it matches the 100% of `brightnessctl`.
SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window): archlinux
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.26
Qt Version: 6.11.1
Lenovo thinkpad T14 Gen 6 with AMD Ryzen AI 7 PRO / Radeon 860M Graphics
It might be linked to https://bugs.kde.org/show_bug.cgi?id=510294 which feels
similar, even if the case is different.
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