Qubes and my Newly Librebooted T480

[amn3sia0x1337]

You can use xrandr in dom0:

Easy brightness adjustment

Ive spent quite a while trying to figure this out and just wanted to pass it on. Click Q in top left corner and open “Terminal Emulator” in Terminal type xrandr -q you will get a print out resembling this Screen 0" minimum blah blah current blah blah HDMI-1 connected primary blah blah numbers numbers more numbers DP-1 disconnected blah blah HDMI-2 disconected blah blah What you want is the bold part. The connected primary. you then type xrandr --output yourConnectedPrimary-whatever …