Why does the brightness go down when unplugging the charger?

Hello! KDE plasma wayland session on fedora 37 here. I noticed that the brightness (even if the indicator always shows 100%) is "less bright" with the charger unplugged, and brighter with the charger plugged in.
the strange thing is that this does not happen instantly, when I unplug it it slowly lowers the brightness, almost imperceptibly, and in about 4~5 seconds it stops at a lower brightness. the same happens when I plug it back.
am I the only one with this problem? googling it returned only unrelated issues.

(note, in settings > energy saving the option to change screen brightness on battery power is unchecked)

thanks in advance!

6 points · 6 comments · view on lemmy.world

6 Comments

trillian@feddit.de · 5 pts · 3y (2 replies)

Did you check the Energy Saving settings? There should be a setting to set the screen brightness dependent on whether the device is plugged in/running on battery.

MartinR@feddit.de · 2 pts · 3y (1 reply)

OP said

(note, in settings > energy saving the option to change screen brightness on battery power is unchecked)

So either that setting is ignored or there's two competing energy saving modules active or there's a but in the setting or something completely else...

tubbadu@lemmy.kde.social · 1 pts · 3y

I have not any other energy saving module installed that I'm aware of

unknowing8343@discuss.tchncs.de · 4 pts · 3y (1 reply)

What computer model is that? Might be a special feature of your firmware.

Maybe you could check under the BIOS/UEFI settings.

tubbadu@lemmy.kde.social · 1 pts · 3y

thanks for the answer!

What computer model is that? Might be a special feature of your firmware.

it's a Dell Vostro 15 3000, I never encountered driver issues with this one so far... do you this this may be the cause?

Maybe you could check under the BIOS/UEFI settings.

I already tried but found nothing useful. Also, I don't recall this type of issue with Xorg, I should check