You have been subscribed to a public bug:
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: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: backlight brightness imac
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backlight brightness control won't work in 2011 iMac 27"
https://bugs.launchpad.net/bugs/818826
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