From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad@darnok.org>
Subject: Re: Desktop Environment/GUI Cannot Start After I Have
 Installed Xen 4.1.3-rc1-pre and Linux Kernel 3.3.0-rc7
Date: Thu, 15 Mar 2012 04:29:10 -0400
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To: "Teo En Ming (Zhang Enming)" <singapore.mr.teo.en.ming@gmail.com>, stefan.bader@canonical.com
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On Thu, Mar 15, 2012 at 2:07 AM, Teo En Ming (Zhang Enming)
<singapore.mr.teo.en.ming@gmail.com> wrote:
> Hi,
>
> I have solved the problem. Xen 4.1.x is incompatible with the onboard
> graphics of Intel DQ45CB motherboard. I have switched the graphics adapter
> to NVIDIA 8400 GS PCI Express x16 and the combination of Xen 4.1.3-rc1-pre,
> kernel 3.3.0-rc7, and NVIDIA 8400 GS works well (Xen 4.1.x is compatible
> with NVIDIA 8400 GS graphics).

<sigh> No. The reason it is not working is b/c you have this in your config:

# CONFIG_INTEL_IOMMU is not set


If you unset that (so CONFIG_INTEL_IOMMU=y) it will work.
Stefan, can this option be set in the Ubuntu kernels?