On Sun, Jan 20, 2013 at 10:52 PM, Mihai Moldovan <ionic at ionic.de> wrote: > the patch does work, i.e., it turns off DMAR for the graphics card and > alleviates the freezes when loading i915/kms. > > However, still seeing random machine freezes with it (being consistent with the > behavior I've experienced with intel_iommu=igfx_off). Thanks for testing, I've just submitted the patch for review. It should included in a -fixes tree soon and the get backported to stable kernels. > The patch + forcing RWBF is working, too. Interestingly, this version didn't > randomly freeze yet, after more than 5 hours of uptime! I'll leave the box > running until tomorrow to make sure I did stick around long enough. > > All those tested kernels were able to handle USB and PCI(e) devices. > > I still have to test turning off IOMMU in general and Intel IOMMU specifically. > Will probably do this tomorrow. Please let me know when this works solidly for you, so that I can put it into a real patch and also submit it for inclusion. Thanks, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
