[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 #123 from Ulf Winkelvos <ulf at winkelvos.de> ---
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.

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