https://bugs.kde.org/show_bug.cgi?id=462140
Bug ID: 462140
Summary: OLED display brightness cannot be increased again once
it reaches zero
Classification: Plasma
Product: Powerdevil
Version: 5.26.3
Platform: Neon
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: mar...@semantic-mediawiki.org
CC: m...@ratijas.tk
Target Milestone: ---
SUMMARY
KDE brightness controls work correctly on OLED display until the brightness
reaches zero. After this, it is impossible to increase the brightness again.
The bug is triggered whenever KDE sets brightness to zero (via brightness key,
brightness slider, or automatically when dimming the screen after inactivity).
If the laptop is closed (sleep) and openen again (waking up), the display is
coming back to normal.
This problem is also discussed in the KDE forum:
https://forum.kde.org/viewtopic.php?f=17&t=175470
STEPS TO REPRODUCE
0. My laptop: Lenovo ThinkPad X1 Yoga Gen 7 (further OLED laptops were reported
to show the same issue, see formum thread)
1. Start laptop
2. Use brightness key to decrease brightness to 0
3. Try to increase brightness again
Alternatively: wait on battery power until screen is disabled, then try to
re-activate the display by any key.
OBSERVED RESULT
Screen stays dark.
EXPECTED RESULT
Screen lights back up.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.26 (Kernel 5.15.0-53-generic, X11)
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7
ADDITIONAL INFORMATION
- Sending the laptop to sleep and waking it up again will restore the display
(until dimmed again)
- The following commands also deactivate the display, but also succeed in
activating it again:
xrandr --output eDP-1 --brightness 0; sleep 1; xrandr --output eDP-1
--brightness 1
- If the screen is disabled by xrandr --output eDP-1 --brightness 0, then it
can also be re-activated by running xrandr --output eDP-1 --brightness 1
through a custom global shortcut. In contrast, KDE brightness controls do not
work in this situation either.
- However, if the screen was disabled through KDE, then even xrandr --output
eDP-1 --brightness 1 does not fix it.
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