Jani Nikula b6dec4194a drm/i915: set backlight duty cycle after backlight enable for gen4 ...

commit 2e7eeeb59a upstream.

For reasons I can't claim to fully understand gen4 seems to require
backlight duty cycle setting after the backlight has been enabled, or
else black screen follows. I don't have documentation for the correct
sequence on gen4 either. Confirmed on Dell Latitude D630 and MacBook4,1.

This fixes a regression introduced by
commit b35684b8fa
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Thu Nov 14 12:13:41 2013 +0200

    drm/i915: do full backlight setup at enable time

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=75791
Reported-and-tested-by: mcy@lm7.fr
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79423
Reported-and-tested-by: Marc Milgram <mmilgram@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2014-07-09 11:21:26 -07:00

..

drm

drm/i915: set backlight duty cycle after backlight enable for gen4

2014-07-09 11:21:26 -07:00

host1x

gpu: host1x: handle the correct # of syncpt regs

2014-04-16 17:11:04 +02:00

vga

vgaswitcheroo: switch the mux to the igp on power down when runpm is enabled

2014-07-09 11:21:25 -07:00

Makefile

gpu: host1x: Add host1x driver

2013-04-22 12:32:40 +02:00