[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

Kamal Mostafa <kamal at canonical.com> changed:

           What    |Removed                     |Added
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 Attachment #107249|0                           |1
        is obsolete|                            |

--- Comment #108 from Kamal Mostafa <kamal at canonical.com> ---
Created attachment 107347
  --> https://bugzilla.kernel.org/attachment.cgi?id=107347&action=edit
i915.disable_pch_pwm boot param

VK, thanks anyway for testing my "possible fix" patch (so much for that idea).

Now I've attached a new patch which adds a boot parameter you can use to
override the dmi table match and inhibit the quirk.  XPS13/UEFI/Legacy people
experiencing the black screen at boot, please apply this patch (on top of
v3.11-rc7 or similar) and try booting with "i915.disable_pch_pwm=0".  Does that
fix the problem?

For reference. with this patch i915.disable_pch_pwm can be set to
 -1: auto (default; allows the disabling of pch_pwm by dmi quirk table match)
  0: inhibits the disabling of pch_pwm (overrides dmi quirk table match)
  1: forces the disabling of pch_pwm

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