[Bug 68471] Display extremely dark on Dell XPS 13 since 3.10 Kernel in EFI mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68471

--- Comment #18 from Dennis Jacobfeuerborn <dennisml at conversis.de> ---
Looks like this broke between these versions:

good = kernel-3.10.4-300.fc19.x86_64 Tue, 30 Jul 2013 11:17:10 UTC
bad =  kernel-3.10.5-201.fc19.x86_64 Wed, 07 Aug 2013 15:07:52 UTC

In the changelog for 3.10.5 I found the following commit:

======================================================================
commit f12155987bdc8d175b41b2fcbd88e8788c1af92d
Author: Kamal Mostafa <kamal at canonical.com>
Date:   Fri Jul 19 15:02:01 2013 -0700

    drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight

    commit e85843bec6c2ea7c10ec61238396891cc2b753a9 upstream.

    BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=47941
    BugLink: https://bugs.launchpad.net/bugs/1163720
    BugLink: https://bugs.launchpad.net/bugs/1162026

    Some machines suffer from non-functional backlight controls if
    BLM_PCH_PWM_ENABLE is set, so provide a quirk to avoid doing so.
    Apply this quirk to Dell XPS 13 models.

    Tested-by: Eric Griffith <EGriffith92 at gmail.com>
    Tested-by: Kent Baxley <kent.baxley at canonical.com>
    Signed-off-by: Kamal Mostafa <kamal at canonical.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
======================================================================

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