[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 #20 from Tommi Kyntola <kynde at ts.ray.fi> ---
The brightness and actual_brightness in sysfs match and behave identically (go
linearily between 0 and 4437 along with the slider in about 10% steps) with
both patches from comment #9 and comment #11.

The unpatched 3.17.1 behaves differently though. From the boot the brightness
and actual_brightness are off by one with the brightness being one less. Every
time I press brightness up or down from the Fn-keys they both drop by 2. I
suppose, the kde powerdevil is not happy with that and fails in what ever
manoeuvre it happens to try.

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