On Thu, May 31, 2012 at 2:45 PM, drago01 <drago01(a)gmail.com> wrote:
On Thu, May 31, 2012 at 8:04 PM, Josh Boyer <jwboyer(a)gmail.com>
>>>> 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"
>> 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(a)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.