Ubuntu
xserver-xorg-video-ati package

  1. Bug #20296
  2. Comment #8

Comment 8 for bug 20296

Revision history for this message
Matthew Garrett (mjg59) wrote :

As far as I can tell, there's no way that the userland ACPI support could be
involved in this in the slightest - Compaq hardware doesn't send ACPI events for
brightness control. This sounds very much like an X issue.