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

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Date:	Tue, 22 Nov 2011 20:15:31 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	Keith Packard <keithp@...thp.com>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when
 reasonable

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? I think that's going to come as a 
surprise to people.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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