From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Bader 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 09:54:16 +0100 Message-ID: <4F61AE38.6060708@canonical.com> References: <4F60BBBA.1060102@gmail.com> <4F618705.6010307@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: konrad@darnok.org Cc: xen-users@lists.xen.org, "Teo En Ming (Zhang Enming)" , xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On 15.03.2012 09:29, Konrad Rzeszutek Wilk wrote: > On Thu, Mar 15, 2012 at 2:07 AM, Teo En Ming (Zhang Enming) > 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). > > 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? Hi Konrad, this is actually different in the current (for 12.04) kernel configurations: CONFIG_INTEL_IOMMU=y # CONFIG_INTEL_IOMMU_DEFAULT_ON is not set The reason it is not on by default is that some machines showed issues https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/907377 Btw, this is talking about a 3.3.0-rc7 kernel, which is either taken from the mainline builds or even self-compiled. 11.10 came with 3.0 and even 12.04 is 3.2 only. -Stefan