[Bug 47941] [snb] Backlight control broken between 3.6.0-rc1 and 3.6.0-rc4

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https://bugzilla.kernel.org/show_bug.cgi?id=47941





--- Comment #76 from Jani Nikula <jani.nikula at intel.com>  2013-05-02 11:35:33 ---
Created an attachment (id=100441)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100441)
drm/i915: enable/modify backlight only if needed

(In reply to comment #75)
> I'm sorry to say that with drm-intel-nightly the backlight does not work on my
> Dell XPS 13.

Please try the attached patch on top of drm-intel-nightly, and see if it helps.
Thanks.

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