Brightness will not change

[pebcak]

Have a look at this thread and see if the solution will work for you as well:

6.1.4 Kernel and Screen brightness problem

Hi, First of all I’m Linux newbie so excuse me for any mistake or dumb question I may make. Question: Does anyone have problems with maxed out screen brightness (on laptop) since 6.1.4 update? Explanation: Since update to 6.1.4, my brightness slider has disappeared from the power manager applet and “/sys/class/backlight/” is empty. Downgrading to 6.1.3 returned brightness slider and “/sys/class/backlight/” now has “intel_backlight” folder (as it should). Problem was noticed on HP EliteBoo…