drm/i915: Fix DPMS and suspend interaction for intel_panel.c

[Takashi Iwai]

[Removed stable-kernel from Cc]

At Fri, 11 Mar 2011 02:35:45 +0100 (CET),
Indan Zupancic wrote:
> 
> drm/i915: Fix DPMS and suspend interaction for intel_panel.c
> 
> When suspending intel_panel_disable_backlight() is never called,
> but intel_panel_enable_backlight() is called at resume. With the
> effect that if the brightness was ever changed after screen
> blanking, the wrong brightness gets restored at resume time.
> 
> Nothing guarantees that those calls will be balanced, so having
> backlight_enabled makes no sense, as the real state can change
> without the panel code noticing. So keep things as stateless as
> possible.
> 
> Signed-off-by: Indan Zupancic <indan at nul.nu>

Indan, when you need a patch to be added to stable kernel, just put
Cc to stable kernel around your sign-off line.  Then Greg will pick it
up automatically once when the patch is merged to Linus tree.

Anyway, the patch looks good to me.  A nice clean-up.

Reviewed-by: Takashi Iwai <tiwai at suse.de>


thanks,

Takashi