I have GREAT news for the 4810T owners the 2.30 BIOS, we now have backlight control keys working
There is a catch after you upgrade to the 2.30 BIOS you will get a freeze type effect on the desktop (well I did). Also I noticed that my WiFi went funny to and I could not ping anything even tho Net. Mgr. was say I was connected to AP.
So DON’T play with backlight key till done the below changes.
You have to change from
xrandr –output LVDS –set BACKLIGHT_CONTROL native
xrandr –output LVDS –set BACKLIGHT_CONTROL kernel
xrandr –output LVDS –set BACKLIGHT_CONTROL combination
 Howto BIOS Update