Public bug reported:

When I press the 'Brightness Control(UP, DOWN)' key in Apple Keyboard,
the OSD shows Increasing Backlight(or Decrease) at the right-top corner.
But the Screen Brightness doesn't changed. 

Also, I waited 15 minutes, the screen turned black. (Power Setting)
But the Backlight still alive.

This iMac has AMD Radeon HD 6970M.
I think maybe it's because the driver doesn't exist in kernel module.

Sorry about my poor English and few information.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: backlight brightness imac

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https://bugs.launchpad.net/bugs/818826

Title:
  backlight brightness control won't work in 2011 iMac 27"

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