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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>
This commit is contained in:
Takashi Iwai 2011-11-16 10:58:03 +01:00 committed by Keith Packard
parent 457eafce61
commit 04b38670cf
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_panel.c
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@ -326,7 +326,8 @@ static int intel_panel_update_status(struct backlight_device *bd)
static int intel_panel_get_brightness(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(bd);
return intel_panel_get_backlight(dev);
struct drm_i915_private *dev_priv = dev->dev_private;
return dev_priv->backlight_level;
}
static const struct backlight_ops intel_panel_bl_ops = {