[Bug 85861] backlight control doesn't work on Lenovo t440p after upgrading to 3.17 [bisected]

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=85861

--- Comment #11 from Jani Nikula <jani.nikula at intel.com> ---
/me scratches head. Please try

commit fff95501f2095fa8a9dbd7e177bbf642d241b2fe
Author: U. Artie Eoff <ullysses.a.eoff at intel.com>
Date:   Mon Sep 29 15:49:32 2014 -0700

    drm/i915: intel_backlight scale() math WA

http://cgit.freedesktop.org/drm-intel/commit/?id=fff95501f2095fa8a9dbd7e177bbf642d241b2fe

on top of vanilla 3.17.something.

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