[Intel-gfx] Patch to fix backlight on GM45

[Peter Clifton]

Without this, querying the backlight value returns half of the value it
has been set to. Hilarity ensues, as my user-space likes to query first
before incrementing / decrementing brightness, leading to brightness
collapsing to near as I try to adjust.

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)
Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)
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