drm/i915: Fix inconsistent backlight level during disabled
authorTakashi Iwai <tiwai@suse.de>
Wed, 16 Nov 2011 09:58:03 +0000 (10:58 +0100)
committerKeith Packard <keithp@keithp.com>
Thu, 17 Nov 2011 20:59:58 +0000 (12:59 -0800)
commit04b38670cf46c096705f24e92a8747d1ab89e53c
tree2aa34cbb1e725f2f2c50bee3d1da76d5cc1e14d5
parent457eafce618cf89125da9d79751d81241bd3fa34
drm/i915: Fix inconsistent backlight level during disabled

When the brightness property is inquired while the backlight is disabled,
the driver returns a wrong value (zero) because it probes the value after
the backlight was turned off.  This caused a black screen even after the
backlight is enabled again.  It should return the internal backlight_level
instead, so that it won't be influenced by the backlight-enable state.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=41926
BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652

Tested-by: Kamal Mostafa <kamal@canonical.com>
Cc: Alex Davis <alex14641@yahoo.com>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Keith Packard <keithp@keithp.com>
drivers/gpu/drm/i915/intel_panel.c