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

[Daniel Vetter]

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
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Daniel Vetter
Mail: daniel@xxxxxxxx
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