On Thu, May 31, 2012 at 1:02 PM, drago01 <drago01@xxxxxxxxx> wrote: > On Wed, May 30, 2012 at 10:32 PM, Reindl Harald <h.reindl@xxxxxxxxxxxxx> wrote: >> >> >> Am 30.05.2012 10:52, schrieb drago01: >>> On Wed, May 30, 2012 at 2:36 AM, Jared K. Smith >>> <jsmith@xxxxxxxxxxxxxxxxx> wrote: >>>> On Tue, May 29, 2012 at 5:29 PM, Reindl Harald <h.reindl@xxxxxxxxxxxxx> wrote: >>>>> Am 29.05.2012 22:45, schrieb Roberto Ragusa: >>>>> i think i have to mention taht VT-d is active in the BIOS and >>>>> i was wondering that it was stable because the combination of the >>>>> i915 options with VT-d (hardware supported virtualization IO) is >>>>> classified to be unstable >>>> >>>> Yes, that's a possible culprit. I've had massive problems with VT-d >>>> enabled on both a Thinkpad T510 and on a Thinkpad X220. I don't >>>> pretend to understand what advantages VT-d is *supposed* to give me, >>>> but it's the first thing I turn off in the BIOS. In fact, on the >>>> T510, I couldn't even get an installation to complete without turning >>>> it off. >>> >>> You could just do boot with intel_iommu=igfx_off to verify that >> >> sounds not really smart if you are using the integrated graphics >> engine as only graphics card which is fast enough for KDE4 3D >> effects and all the things you need if you are not a gamer :-) > > You misunderstood this completely this won't "turn off your GPU" but > just disables DMAR for it ... > You shouldn't notice any difference neither in KDE nor in games. You're aware that doesn't actually do anything in Fedora kernels, right? We've been carrying a patch called linux-2.6-intel-iommu-igfx.patch for quite some time that removes the igfx_off variable and replaces it with an igfx_on variable and defaults to having the DMAR disabled without igfx_on being specified. In fact: From: drago01 <drago01@xxxxxxxxx> Date: Wed, 26 Oct 2011 13:37:27 -0400 Subject: [PATCH] Default to igfx_off josh -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
