[Bug 47941] [snb] Backlight control broken between 3.6.0-rc1 and 3.6.0-rc4

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=47941

Colin Guthrie <colin at mageia.org> changed:

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                 CC|                            |colin at mageia.org

--- Comment #117 from Colin Guthrie <colin at mageia.org> ---
Created attachment 113291
  --> https://bugzilla.kernel.org/attachment.cgi?id=113291&action=edit
Updated version of i915.disable_pch_pwm command line patch for v3.12

I second Ulf's comment. v3.12 is the first kernel I've been able to boot since
3.9.8 on my XPS13+UEFI, but the backlight is busted due to the quirk.

Applying this patch and setting i915.disable_pch_pwm=0 on the command line
gives me a working system!

Are there any working patches to do this automatically in the pipeline that I
may have missed or can we get this quirk control patch applied in the short
term?

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