Re: F16: Sandy Bridge -> lags, missing effects, ui-crashes

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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.
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