From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when reasonable Date: Wed, 23 Nov 2011 16:41:28 +0100 Message-ID: <20111123154128.GG3864@phenom.ffwll.local> References: <1321684889-18691-1-git-send-email-keithp@keithp.com> <20111122201531.GD5547@srcf.ucam.org> <861uszfrah.fsf@sumi.keithp.com> <20111123102643.GB3864@phenom.ffwll.local> <1322056914.15493.158.camel@shinybook.infradead.org> <20111123143931.GE3864@phenom.ffwll.local> <1322060623.15493.168.camel@shinybook.infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1322060623.15493.168.camel@shinybook.infradead.org> Sender: linux-kernel-owner@vger.kernel.org To: David Woodhouse Cc: Daniel Vetter , rajesh.sankaran@intel.com, Keith Packard , Matthew Garrett , intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org 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@ffwll.ch Mobile: +41 (0)79 365 57 48