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

On Tue, 22 Nov 2011 20:15:31 +0000, Matthew Garrett mjg@redhat.com wrote:

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.

You'd have to go into the BIOS to turn this on for most machines at least?

But, yeah, it seems like we should be turning DMAR off unless explicitly requested; I can't understand how you'd ever need this running native on the hardware. Not exactly an area I care about deeply; I've always worked hard to make sure all virtualization garbage is disabled on every machine I use.