[Intel-gfx] [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when reasonable

[Eugeni Dodonov]

On Tue, Nov 22, 2011 at 18:15, Matthew Garrett <mjg at redhat.com> wrote:

> On Fri, Nov 18, 2011 at 10:41:29PM -0800, Keith Packard wrote:
>
> > +     /*
> > +      * Only enable RC6 if all dma remapping is disabled, or if
> > +      * there's no iommu present in the machine.
> > +      */
> > +     if (INTEL_INFO(dev)->gen == 6)
> > +             return no_iommu || dmar_disabled;
>
> So the user has to choose between 5W of power saving or having dmar? And
> we default to giving them dmar?


>From the latest investigations, it is either this, or random gpu hangs and
crashes when both are enabled :(.

When the root cause will be discovered, we should allow both of course. But
so far, all the attempts on this weren't successful.

-- 
Eugeni Dodonov
<http://eugeni.dodonov.net/>
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