Display brightness attenuated when switching from battery to electricity.

[soniabu]

Hi everyone.
Even if I haven't written previously, this always happens to the video of my PC in Bookworm: when I switch from using the battery to electricity, the brightness is significantly attenuated and, to restore it, I have to boot again with the plug inserted into the socket . I have always considered the vice versa correct as I assume it serves to prolong the use of the battery.
Of course, this doesn't happen if, for example, I use Tails or another OS.
Does anyone have any idea how I can solve this?.
Thank you and try to always stay well.
sonia.