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

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Date:	Wed, 23 Nov 2011 16:41:28 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Daniel Vetter <daniel@...ll.ch>, rajesh.sankaran@...el.com,
	Keith Packard <keithp@...thp.com>,
	Matthew Garrett <mjg@...hat.com>,
	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 Wed, Nov 23, 2011 at 03:03:43PM +0000, David Woodhouse wrote:
> On Wed, 2011-11-23 at 15:39 +0100, Daniel Vetter wrote:
> > At least for the dmar+gfx+semaphores hang I can reproduce, just disabling
> > dmar with intel_iommu=igfx_off is not good enough and iirc the same holds
> > for the dmar+rc6 hangs reported. 
> 
> Um... let me restate that for clarity (and partly for Rajesh's benefit).
> 
> The DMAR associated with the integrated graphics is *disabled*.
> Turned off. Not active. Ever.

Hm, that comment confuses me a bit. I've always thought that igfx_off only
instantiates a identity mapping and leaves the dmar unit on. Is that
wrong?
-Daniel
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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