https://bugs.kde.org/show_bug.cgi?id=394945
--- Comment #5 from m_loui...@yahoo.com ---
I could reproduce it with powerdevil
4:5.24.4-0xneon+20.04+focal+release+build46. I used the following settings
(translating labels back from French):
* In the "Advanced" page:
* Weak level = 90%
* Critical level = 80%
* In the "Energy saving" page:
* Check "Screen brightness" and set the level to about 30% (which is the
default anyway)
Then I set the brightness to 10% and let the battery drain from its initial
93%. When it reached 90% the brightness went up to 30% as specified in the
configuration. I reproduced it again setting 85% as the weak level.
Note that there is no OSD notification of the new luminosity level, so you need
to set something visibly different or look in the applet.
I'll try to gdb in and understand what's going on at
https://invent.kde.org/plasma/powerdevil/-/blob/master/daemon/actions/bundled/brightnesscontrol.cpp#L84.
This code appears to be duplicated for keyboard brightness, so both will need a
fix.
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