I have desktop pc with monitor(VA24D) and RX6600.
Sometimes when booting, logging, when monitor goes to sleep or when changing its settings it becomes very dark. It didn’t fix after update, issue persists among DEs, KDE Plasma or Sway, logging screen.
It didn’t happen before, it is same installation for 1+ years.
In monitor settings it shows 100% brightness, monitor’s settings ui is as bright as it should be, but everything else is darker. Howewer, sometimes it shows 9% brightness and chaning it to 100% temporary fixes the issue. One time screen was dark even in grub. Last time when it was dark, during shutdown when it showed logs it was bright.
I dual booted Debian and there seem to be no such issue. There is no issue in UEFI settings too.
I have no clue where the issue is, maybe it is amdgpu driver or my monitor or smth else.
It is unusable when screen goes dark, I barely can see it.
I hope that someone will figure out the issue and fix it.
P.S: brightnessctl has no effect at all.