Unable to control brightness with Wayland. Able to with X11

General system Newbie
1

Just did a reinstall of EndeavourOS. My DE is KDE. I used to run XFCE. On XFCE, there was only x11 support, which I was comfortable with. When I installed KDE, I switched to Wayland, however I seem to have no brightness control anymore.

Any games I play seem dark, and if I move the brightness sliders, nothing happens. My system tray brightness control is at 100% and its still dark.

I tried brightnessctl, but my only options are 0 (0%) and 1 (100%). Setting it to either does nothing and the screen brightness stays the same.

Switching to x11 seems to fix the problem and I have my brightness controls again. Can anyone help? I can stick with x11 for now, but I would like to find a fix.

2

Hello @saminbc ,

brightnessctl s 5%+    # assign to (Fn+)F6
brightnessctl s 5%-    # assign to (Fn+)F5

Reassign Shortcuts / Power Management / In(De)crease Screen Brightness.
With Shift the delta is 1% if needed.

If brightnessctl is uninstalled it still works so IDK which is the real function.

3

May need to adjust the config settings; the brightnessctl settings are not identical. From the man page:

brightnessctl set 50%-
           Subtracts 50% of the maximum from the current brightness.
brightnessctl set +10%
           Adds 10% of the maximum to the current brightness.

The minus and plus signs are on different sides of the amount to increase or decrease. I think this is to prevent the negative amount from being parsed as a command-line option.