Quote Originally Posted by tijmz View Post
I tried this on Karmic (on a 4810T) and got this:

tijmz@Eurydice:~$ xrandr --output LVDS --set BACKLIGHT_CONTROL native
X Error of failed request:  BadRROutput (invalid Output parameter)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  15 (RRGetOutputProperty)
  Serial number of failed request:  26
  Current serial number in output stream:  26
Does anyone have any suggestions? I'd like to be able to change brightness settings
Read the last page or so of comments, you have to add "nomodeset acpi_backlight=vendor" to the kernel line of GRUB2.