Re: [Intel-gfx] kernel BUG at drivers/gpu/drm/i915/i915_gem
From: Keith Packard
Date: Fri Dec 16 2011 - 12:05:45 EST
On Fri, 16 Dec 2011 17:38:39 +0100, tino.keitel+xorg@xxxxxxxx wrote:
> Hum, could this be related to the RC6 vs. IOMMU issue? I have
> CONFIG_INTEL_IOMMU enabled in 3.2, and disabled in 3.1, and boot with
> i915.i915_enable_rc6=1.
Very likely -- RC6 and semaphores are not compatible with IOMMU. You
should be able to just disable VTd in your BIOS and use the kernel with
IOMMU enabled.
--
keith.packard@xxxxxxxxx
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