linux-kernel - Re: [Intel-gfx] kernel BUG at drivers/gpu/drm/i915/i915

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Message-ID: <864nx08mzq.fsf@sumi.keithp.com>
Date:	Fri, 16 Dec 2011 09:06:33 -0800
From:	Keith Packard <keithp@...thp.com>
To:	tino.keitel+xorg@...ei.de, Daniel Vetter <daniel.vetter@...ll.ch>,
	Rocko Requin <rockorequin@...mail.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] kernel BUG at drivers/gpu/drm/i915/i915_gem

On Fri, 16 Dec 2011 17:38:39 +0100, tino.keitel+xorg@...ei.de 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@...el.com

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