Dave Airlie wrote:
> I think this was an mtrr missing workaround,
> 
> I think we dropped this in favour of fixing things properly, correct
> me if I'm wrong.

You are right. There was a missing MTRR entry that X.org could not
successfully create.

I was using a kernel with PAT disabled (now more difficult due to:
http://git.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=commitdiff;h=c03cb3149daed3e411657e3212d05ae27cf1a874
 )

And with PAT disabled, the problem of the missing MTRR entry is fixed
with this patch:
http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commitdiff;h=2992e545ea006992ec9dc91c4fa996ce1e15f921

So, with these two patches, the problem is fixed for me and the patch
below can be dropped. Thank you very much!

Best regards,
  Thomas

> > Signed-off-by: Thomas Schlichter <[email protected]>
> > Cc: Dave Airlie <[email protected]>
> >
> > Cc: Eric Anholt <[email protected]>
> > Signed-off-by: Andrew Morton <[email protected]>
> > ---
> >
> >  include/drm/drm_pciids.h |    1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff -puN
> > include/drm/drm_pciids.h~drm-via-add-pci-id-for-via-vx800-chipset
> > include/drm/drm_pciids.h ---
> > a/include/drm/drm_pciids.h~drm-via-add-pci-id-for-via-vx800-chipset +++
> > a/include/drm/drm_pciids.h
> > @@ -477,6 +477,7 @@
> >        {0x1106, 0x3343, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
> >        {0x1106, 0x3230, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_DX9_0}, \
> >        {0x1106, 0x3157, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_PRO_GROUP_A}, \
> > +       {0x1106, 0x1122, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_DX9_0}, \
> >        {0, 0, 0}
> >
> >  #define i810_PCI_IDS \
> > _

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