[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 #21 from Tommi Kyntola <kynde at ts.ray.fi> ---
And by "from the boot" I'm not talking about init=/bin/sh or anything like
that, but rather when the system is fully up yet without having touched the
brightness controls, which most likely means that the kde powerdevil has
already made some adjustments.

When I booted (the unpatched 3.17.1) to a single user mode without X the values
were both at the max 4437 and a manual setting to 3993 (i.e. $(( 4437 * 9 / 10
))) resulted in brightness setting of 3993 and actual_brightness 3992. I didn't
try this with the patched kernels as I have no reason to expect the numbers
wouldn't match in them because the do that already when up and running and kde
powerdevil is happy with both of them.

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