[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

--- Comment #124 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Ulf Winkelvos from comment #123)
> In csm mode I can control brightness via intel_backlight, when I echo zero
> to the acpi_backlight before, but then the backlight is flickering at lower
> levels. Without your patch, so with the quirk mode introduced in kernel 3.10
> (?) up to 3.12, I can control brighntess via acpi_backlight just fine. But
> in no csm setup can I control the brightness via both interfaces. In uefi
> mode on the contrary with those patches the brightness is controllable via
> both interface and setting the one proportionally chages the other.

Please try this on top of linux-next branch of [1] with
video.use_native_backlight=1 module parameter.

[1] http://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git

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