On Wed, 16 Nov 2011 22:11:06 -0800 keith.packard at intel.com wrote: > On Wed, 16 Nov 2011 16:56:16 -0800, Ben Widawsky <ben at bwidawsk.net> wrote: > > > The variable you want is: !intel_iommu_gfx_mapped > > From what Daniel Vetter said: > > > Last time I've played around with all the combinations, only > > intel_iommu=off was good enough to prevent the hang. > > intel_iommu=igd_off still hangs (which is what the current value > > exported by the dmar code dopends on, iirc). If I remember things > > correctly, intel_iommu=off also reliably works around issues for all > > reporters (both semaphores and rc6). > > we need to use dmar_disabled instead of intel_iommu_gfx_mapped. Other > places in the code use: > > if (no_iommu || dmar_disabled) > As long as he meant igfx_off, then okay... igd_off didn't immediately register to me earlier. Sorry for the confusion.
