[Bug 76276] Backlight control broken on Dell XPS13 w/ kernel 3.14-rc7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76276

--- Comment #41 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #40)
> I experience a similar issue as this on a DELL XPS M1330 (Arch linux).
> 
> I have tried 3.15-rc5 but that doesn't fix it. Reverting back to 3.13.8 does.
> 
> # echo 255000 > /sys/class/backlight/intel_backlight
> 
> Will temporarily fix it on kernels >= 3.14.1.
> 
> I don't know if it's exactly the same bug since it isn't fixed in 3.15-rc5
> for me. Should I file a new bug?

Please do, it's a different bug. In that new bug, please attach dmesg from
early boot to the problem, with drm.debug=0xe module parameter set, and also
attach /sys/kernel/debug/dri/0/i915_opregion.

This bug remains open solely for following through with the stable backport
mentioned in comment #38.

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