> I have a similar problem. I see an authentication box when I try to adjust > screen brightness on the gdm screen, but not when logged into gnome. Does > this happen when you are logged in?
Yeah, it happens when I'm logged in to a custom .xsession where I'm using Emacs as my window manager. I installed GNOME to see whether the problem exists there and it turns out that everything works fine when logged in to a GNOME session. Should I be able to use "brightnessctl" without sudo if I'm in the "video" group? Looks like I'm not able to: --- λ brightnessctl set 200 Can't modify brightness: Permission denied You should run this program with root privileges. Alternatively, get write permissions for device files. --- Thanks! David
