Commit 04b38670 authored by Takashi Iwai's avatar Takashi Iwai Committed by Keith Packard

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/872652Tested-by: default avatarKamal Mostafa <kamal@canonical.com>
Cc: Alex Davis <alex14641@yahoo.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
parent 457eafce
......@@ -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 = {
......
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