[Bug 68355] [HSW ULT] eDP backlight regression at 1920x1080

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68355

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #0)
> 1. Install 3.11.0-rc1, reboot, watch it work
> 2. Install 3.11.0-rc2, reboot, watch it fail

Presumed broken by the ACPI pull ea45ea70b6131fa0b006f5b687b9b1398b24f681,
which caused regressions. The problematic changes were reverted in v3.11-rc3 by 

commit 8e5c2b776ae4c35f54547c017e0a943429f5748a
Author: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Date:   Thu Jul 25 21:43:39 2013 +0200

    Revert "ACPI / video / i915: No ACPI backlight if firmware expects Windows
8

The related bug is: https://bugzilla.kernel.org/show_bug.cgi?id=51231

> 3. Install 3.11.0-996.201308070456, reboot, watch it work
> 4. Install 3.11.0-996.201308080456 (notice the date is just the next day),
> reboot, watch it fail
> 5. Install any kernel after rc1 or the 996.20130807, reboot, watch it fail.

I don't know what these are. linux-next? Please try upstream v3.11-rc6 first.

Two things to try, separately, running v3.11-rc6:

1) What if you drop acpi_backlight=vendor from the kernel parameters?

2) What if you add acpi_osi="!Windows 2012" to the kernel parameters?

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