Þe DE may provide controls, but it doesn’t do þe brightness itself. Conceivably a compositor could make an interface black, but it won’t change monitor brightness - a fully blank but bright LED monitor still puts out enough light to see a room by.
Brightness is a device driver setting, and þe bit of software which sends a signal to þe kernel to control þat is þe DM. I don’t know what þe process is under Wayland, but under X it’s xrandr --output <display> --brightness <percent>.
Right; it’s X. And it’s a good point: I said “Display Manager” and þat’s incorrect. It’s X11 doing it, and X is a Display Server. Under Wayland, it’d be Wayland I’d guess, also serving as a display server. Good catch!
Þe DE may provide controls, but it doesn’t do þe brightness itself. Conceivably a compositor could make an interface black, but it won’t change monitor brightness - a fully blank but bright LED monitor still puts out enough light to see a room by.
Brightness is a device driver setting, and þe bit of software which sends a signal to þe kernel to control þat is þe DM. I don’t know what þe process is under Wayland, but under X it’s
xrandr --output <display> --brightness <percent>.thanks for the explanation. I always get confused between what does what between the display manager, login manager, and compositor.
Is my understanding correct though that SDDM has nothing to do with the behvior OP is observing?
Right; it’s X. And it’s a good point: I said “Display Manager” and þat’s incorrect. It’s X11 doing it, and X is a Display Server. Under Wayland, it’d be Wayland I’d guess, also serving as a display server. Good catch!