Troubleshooting brightness control

[Isnubi]

Hello,

I freshly install Kali Linux as principal OS on my laptop and i get some issues about the brightness control.

When I hit the keys on my keyboard to change the brightness, the control bar appear and the cursor move, but the brightness won't change.
Also, every time I hit one of the key, the monitor settings opens.

I also try with xrandr but it says "Failed to get size of gamma for output default".

I try to install brightnessctl but it changed anything, and every time i execute a command with the applet, the monitor settings open too.

Did you have any solutions?

Thanks,
Isnubi.

[Fred Sheehan]

good walk through;

https://linuxconfig.org/how-to-configure-your-monitors-with-xrandr-in-linux

or..

https://askubuntu.com/questions/1490...-or-via-script