Re: [PATCH] drm/i915: do not disable backlight on vgaswitcheroo switch off

[Daniel Vetter <daniel@ffwll.ch>]

On Wed, Aug 07, 2013 at 09:26:34AM +0300, Jani Nikula wrote:
> On Thu, 25 Jul 2013, Jani Nikula <jani.nikula@intel.com> wrote:
> > On muxed systems, the other vgaswitcheroo client may depend on i915 to
> > handle the backlight. We began switching off the backlight since
> >
> > commit a261b246ebd552fd5d5a8ed84cc931bb821c427f
> > Author: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Date:   Thu Jul 26 19:21:47 2012 +0200
> >
> >     drm/i915: disable all crtcs at suspend time
> >
> > breaking backlight on discreet graphics in (some) muxed systems.
> >
> > Keep the backlight on when the state is changed through vgaswitcheroo.
> >
> > Note: The alternative would be to add a quirk table to achieve the same
> > based on system identifiers, but AFAICS it would asymptotically approach
> > effectively the same as this patch as more IDs are added, but with the
> > maintenance burden of the quirk table.
> >
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=55311
> 
> Tested-by: Fede <fedevx@yahoo.com>
> Tested-by: Aximab <laurent.debian@gmail.com>
> 
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59785
> 
> Tested-by: sfievet <sebastien.fievet@free.fr>

Picked up for -fixes (with a cc: stable), thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch