https://bugzilla.kernel.org/show_bug.cgi?id=42182
Alex Deucher alexdeucher@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |alexdeucher@gmail.com
--- Comment #1 from Alex Deucher alexdeucher@gmail.com 2012-08-30 13:46:33 --- Is this still an issue with a newer kernel? Make sure your kernel has the acpi backlight controls included. My drm-next queue for 3.7 has support for native backlight control (assuming the OEM uses the on chip backlight controller) if you can't get the acpi backlight controls working.
http://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-3.7-wip