On Tue, 2011-11-15 at 21:28 +0100, Takashi Iwai wrote:
> My rough guess is the inconsistency of property taken during the
> backlight disabled. How about the patch below (untested!) in addition
> to the fix in 3.2?
>
>
> Takashi
Yes Takashi, your patch below (plus the already committed fix[0]) does
indeed fix the problem[1] for me. Thanks!
Tested-by: Kamal Mostafa <kamal at canonical.com>
-Kamal
[0] f52c619a590fa75276c07dfcaf380dee53e4ea4c
drm/i915/panel: Always record the backlight level again (but cleverly)
[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652
> ---
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index 499d4c0..21f60b7 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -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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