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

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On Tue, Nov 22, 2011 at 18:15, Matthew Garrett <mjg@xxxxxxxxxx> 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

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