[Raring][pull-request] i915 Sandybridge-M backlight fix

[Kamal Mostafa]

BugLink: http://bugs.launchpad.net/bugs/954661

This small i915 backlight initialization fix (cherry-picked from the
drm-intel-nightly tree) enables working brightness controls on Dell XPS 13 and
other Sandybridge-Mobile GPU machines.

This patch is low-risk for Raring: the fix restores part of the backlight init
sequence to the way it had worked before a recent change in August broke it.
The pending commit in drm-intel-nightly is marked cc: stable, but it may not
land in mainline before 3.9.

Thanks,

 -Kamal


---- >8 ------------------

The following changes since commit 150b0fcdb7e54c32e3f64d13df0fa08e7e60c453:

  UBUNTU: [Config] enable CONFIG_AUFS_EXPORT to allow nfs exports (2013-02-12 11:38:36 +0000)

are available in the git repository at:

  git://kernel.ubuntu.com/kamal/ubuntu-raring.git i915-backlight

for you to fetch changes up to c82fa02edbf99e6c2fc6ee4e22eecf4d7d3fb437:

  UBUNTU: SAUCE: drm/i915: write backlight harder (2013-02-12 10:42:31 -0800)

----------------------------------------------------------------
Daniel Vetter (1):
      UBUNTU: SAUCE: drm/i915: write backlight harder

 drivers/gpu/drm/i915/intel_panel.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)