[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 #22 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Tommi Kyntola from comment #20)
> 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.

If that really is the reason for the breakage, the userspace is making
assumptions it really shouldn't be making.

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