On Tue, Nov 22, 2011 at 06:46:21PM -0200, Eugeni Dodonov wrote: > On Tue, Nov 22, 2011 at 18:15, Matthew Garrett <mjg at redhat.com> 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 :(. So blacklist dmar on sandybridge. The power saving is going to be more important for most users. -- Matthew Garrett | mjg59 at srcf.ucam.org
