On Wed, 22 Jun 2011, Keith Packard wrote:

> On Wed, 15 Jun 2011 13:32:56 -0700, Jesse Barnes <jbarnes at 
> virtuousgeek.org> wrote:
> 
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c 
> > b/drivers/gpu/drm/i915/i915_drv.c
> > index 0defd42..a1a28fb 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -429,6 +429,9 @@ static int i915_drm_thaw(struct drm_device *dev)
> >     /* KMS EnterVT equivalent */
> >     if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> >             mutex_lock(&dev->struct_mutex);
> > +
> > +           intel_init_clock_gating(dev);
> > +
> >             dev_priv->mm.suspended = 0;
> >  
> >             error = i915_gem_init_ringbuffer(dev);
> > diff --git a/drivers/gpu/drm/i915/i915_suspend.c 
> > b/drivers/gpu/drm/i915/i915_suspend.c
> > index 60a94d2..b478d16 100644
> > --- a/drivers/gpu/drm/i915/i915_suspend.c
> > +++ b/drivers/gpu/drm/i915/i915_suspend.c
> > @@ -863,8 +863,6 @@ int i915_restore_state(struct drm_device *dev)
> >             I915_WRITE(IMR, dev_priv->saveIMR);
> >     }
> >  
> > -   intel_init_clock_gating(dev);
> > -
> >     if (IS_IRONLAKE_M(dev)) {
> >             ironlake_enable_drps(dev);
> >             intel_init_emon(dev);
> > 
> 
> I haven't seen any comments as to whether this patch needs to be merged
> into the kernel. Has anyone tested this?

I have tested it, and it worked well on my system:

        http://marc.info/?l=linux-kernel&m=130817292323254&w=2

Alan Stern

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