bd->props.brightness doesn't reflect the actual backlight level.
Always invoke backlight_update_status when users want to change
the backlight.
For setups where brightness change is an expensive operation,
this could be done in the driver rather than the core.
http://bugzilla.kernel.org/show_bug.cgi?id=12249
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 9593fdc..a9c013b 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -131,10 +131,8 @@
else {
pr_debug("backlight: set brightness to %lu\n",
brightness);
- if (bd->props.brightness != brightness) {
- bd->props.brightness = brightness;
- backlight_update_status(bd);
- }
+ bd->props.brightness = brightness;
+ backlight_update_status(bd);
rc = count;
}
}