$ lsb_release -r Release: 14.04
Display driver: fglrx (2:13.350-0ubuntu1) trusty, which is 14.1 beta
Hardware: HD8250, also expected on all hd 6xx, 7xx, 8xx adaptors.
Backlight is not adjustable. /sys/class/backlight/ directory is empty.
$ lsb_release -r
Release: 14.04
Display driver: fglrx (2:13.350-0ubuntu1) trusty, which is 14.1 beta
Hardware: HD8250, also expected on all hd 6xx, 7xx, 8xx adaptors.
Backlight is not adjustable. backlight/ directory is empty.
/sys/class/