For a long time. I used a shell script to brighten and dim my laptop monitor,
because the Fn+F5 and Fn+F6 combinations did not work.11 From what I could
tell, X11 didn’t understand keys were pressed at all. I remember fixing it, but
I’m not sure what I did to fix it. While looking for stuff to include in my
backups, I discovered
/etc/X11/xorg.conf.d/40-video.conf which contains
Section "Device" Identifier "Card0" Driver "intel" Option "Backlight" "intel_backlight" Option "SWcursor" EndSection
This may or may not be part of the solution. I have also changed
/etc/default/grub to include22 where my addition is the last part of the
I have some vague memory of this being relevant as well.
So there you go. May or may not work. Might not be needed at all these days! Linux evolves surprisingly quickly when you are not waiting for a particular feature.