[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 #106 from Kamal Mostafa <kamal at canonical.com> ---
Created attachment 107249
  --> https://bugzilla.kernel.org/attachment.cgi?id=107249&action=edit
possible fix for XPS13+UEFI+Legacy

For the record: Note that some XPS13-IvyBridge+UEFI+Legacy users (Martin and
others) report that the committed "quirk no PCH_PWM_ENABLE" patch fixes their
previously broken backlight control, whereas other users with the same
configuration (Evan Callicoat and VK) report that it breaks their backlight on
startup.

I'm attaching an additional test patch here (applies on top of "drm/i915: quirk
no PCH_PWM_ENABLE for Dell XPS13 backlight" already in 3.11 and 3.10).

Evan and VK, please advise whether or not this additional patch helps on your
UEFI+Legacy machines.  (Other XPS13 testers may also wish to confirm that it
still fixes backlight control on non-UEFI XPS13's -- my testing indicates that
it does).

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