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

Josh Boyer jwboyer at gmail.com
Thu May 31 19:07:52 UTC 2012

On Thu, May 31, 2012 at 2:45 PM, drago01 <drago01 at gmail.com> wrote:
> On Thu, May 31, 2012 at 8:04 PM, Josh Boyer <jwboyer at gmail.com> wrote:
>>>>> 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.
>> You're aware that doesn't actually do anything in Fedora kernels,
>> right?  We've been carrying a patch called
>> linux-2.6-intel-iommu-igfx.patch for quite some time that removes the
>> igfx_off variable and replaces it with an igfx_on variable and defaults
>> to having the DMAR disabled without igfx_on being specified.  In fact:
>> From: drago01 <drago01 at gmail.com>
>> Date: Wed, 26 Oct 2011 13:37:27 -0400
>> Subject: [PATCH] Default to igfx_off
> Oops ... has been a while ;)

Good reminder though.  Now that I've said we carry that, we discussed
it in the #fedora-kernel channel and we're going to drop it in rawhide.
So, in the future that option will indeed be viable but hopefully Intel
fixes up i915 so it's not needed.


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