Suspect this is more general than just package 'xserver-xorg-video-ati (Ubuntu)' - I have a Toshiba Portege with S3 Savage and the LCD backlight never turns off.
This may be related to the general X.org 7.1 ACPI bug found recently - more details here: https://launchpad.net/distros/ubuntu/+source/xorg/+bug/72231 -- Laptop backlight stays always on https://launchpad.net/bugs/71368 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
