Re: [git pull] drm main pull for 3.4-rc1

Daniel Vetter
2012-03-27T20:41:23Z

On Tue, Mar 27, 2012 at 09:31:24PM +0200, Daniel Vetter wrote:
> On Mon, Mar 26, 2012 at 03:44:33PM +0100, Tony Vroon wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On 26/03/12 15:32, Daniel Vetter wrote:
> > > Also, can you check whether disabling vt-d does work around the
> > > issue?
> >
> > Yes, that does appear to stay operational for longer on:
> > Linux adrastea 3.3.0-06972-ge22057c #1 SMP PREEMPT Mon Mar 26 11:29:21
> > BST 2012 x86_64 Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz GenuineIntel
> > GNU/Linux
> >
> > Obviously I would like to have x2apic and my IOMMU back...
>
> Can you try out the for-chainsaw branch from
>
> git://people.freedesktop.org/~danvet/drm
>
> Afaics it seems to help here on my snb with VT-d enabled. But that means
> it'll still crash eventually with tons of DMAR fault message (like yours).
> But compared to previous kernels it now doesn't insta-die for me. So no
> high hopes, please, but it would be interesting to know how this fares for
> you.
>
> Meanwhile I'll be trying a few other funky tricks.

Yet another thing to try: Can you append intel_iommu=igfx_off to your
kernel cmdline? If you can, try this both on mainline kernels and with my
additional patches.
-Daniel
--
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48