https://bugs.kde.org/show_bug.cgi?id=501451
Bug ID: 501451
Summary: The previous screen brightness is not restored when
power is restored, after the laptop was in a low
battery state
Classification: Plasma
Product: plasmashell
Version: 6.3.2
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: plasma-b...@kde.org
Reporter: ilikef...@waterisgone.com
Target Milestone: 1.0
SUMMARY
The previous screen brightness is not restored when power is restored, after
the laptop was in a low battery state
STEPS TO REPRODUCE
1. Scroll up over the Brightness and Color widget to set the screen brightness
to 100%, if was not already there.
2. Disconnect the power cable or turn off the power outlet, if you have a
button on it for that.
3. Wait until the battery is low and the screen brightness has been
automatically set to 30%.
4. Connect the power cable or turn on the power out, if you did that instead.
OBSERVED RESULT
1. When battery gets into the 'low' state, the screen brightness goes from 100%
to 30%.
2. When the power is back on, meaning that the power comes from the wire and
not from battery, the brightness it doesn't go from 30% back to 100% where it
was before the power was interrupted.
Restoring the power doesn't also restores the brightness.
EXPECTED RESULT
Restoring the power restores the previous screen brightness level.
In my case it was set to 100%, but if I was setting it to 90% or 80% while the
power was connected, then after disconnect and restoring the power again, the
screen brightness would be restored to 90% or 80% like before.
Manually setting the screen brightness to a specific value, it's exactly as
explaining to the computer what it's my preference for the brightness.
The computer should not decide on it's own to change my preference.
It's understandable and accepted that it's automatically set to 30% when the
battery is very low to keep it on as long as possible.
But it's not, that not everything is restored to their previous values when the
power comes back again.
SOFTWARE/OS VERSIONS
Linux (Debian 13 - unstable repository)/KDE Plasma:
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.12.17-amd64 (64-bit)
Mesa Version: 25.0.0-1
Graphics Platform: Wayland
HARDWARE SPECIFICATIONS
Hardware: Laptop Dell Inspiron 5770 (17" 1080p@60Hz screen)
CPU: Intel® Core™ i5-8250U CPU @ 1.60GHz
GPU 1: Intel® UHD Graphics 620 (main, Vulkan capable)
GPU 2: AMD Radeon R5 M465 Series
RAM: 8 GiB (7.7 GiB usable)
ADDITIONAL INFORMATION
BTW, my laptop also has a illuminated keyboard.
That could be turned off completely when the battery is low, but when the power
comes back, I expect that the illumination level goes back to its previous
level, like the screen brightness.
So, for both the screen and the keyboard, I expect that their manually set
levels (by scrolling over the widgets or by dragging the sliders inside) are
restored when the power comes back.
If other changes were made that I'm not aware now, while the battery was low, I
expect that those too come back to their previous levels.
BTW, my laptop has a loose power connector and it disconnects a lot while in
bet and it's very annoying to have to manually fix the screen brightness too
after I plug the power connector back in.
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