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

[drago01]

On Wed, May 30, 2012 at 10:32 PM, Reindl Harald <h.reindl at thelounge.net> wrote:
>
>
> Am 30.05.2012 10:52, schrieb drago01:
>> On Wed, May 30, 2012 at 2:36 AM, Jared K. Smith
>> <jsmith at fedoraproject.org> wrote:
>>> On Tue, May 29, 2012 at 5:29 PM, Reindl Harald <h.reindl at thelounge.net> 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
>
> sounds not really smart if you are using the integrated graphics
> engine as only graphics card which is fast enough for KDE4 3D
> effects and all the things you need if you are not a gamer :-)

You misunderstood this completely this won't "turn off your GPU" but
just disables DMAR for it ...
You shouldn't notice any difference neither in KDE nor in games.