Ubuntu
hal package

  1. Bug #226894
  2. Comment #25

Comment 25 for bug 226894

Revision history for this message
Alexander Jones (alex-weej) wrote : Re: [Bug 226894] Re: Backlight control does not work on MacBook Pro 3.1

The only other reason is that the kernel module is not autoloaded. Again
it's fixed in more recent kernels.