From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: PVOPS dom0 requires nomodeset to boot but video
	requires modesetting driver
Date: Fri, 27 May 2011 09:55:45 -0400
Message-ID: <20110527135545.GA6734@dumpdata.com>
References: <56912983-0699-4D79-8914-0805D9FA7DDA@nrl.navy.mil>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Return-path: <xen-devel-bounces@lists.xensource.com>
Content-Disposition: inline
In-Reply-To: <56912983-0699-4D79-8914-0805D9FA7DDA@nrl.navy.mil>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: "John McDermott (U.S. Navy Employee)" <john.mcdermott@nrl.navy.mil>
Cc: xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

On Fri, May 27, 2011 at 08:50:45AM -0400, John McDermott (U.S. Navy Employee) wrote:
> Xen Users,
> 
> In trying to bring up a new machine, I have debugged to the point that it appears that nomodeset is required to boot a pvops dom0 on Xen 4.0.1, on this machine (otherwise a udevd failure), but the video will not work without KMS, i.e. dom0 gets a "No modesetting driver detected" error. Everything in dom0 works fine remotely, including X forwarding, but no GUI on the console. I have tried all combinations of iommu, nomodeset, and nopat. I have also tried intel_iommu=igfx_off, without changing the results.
> 

You need to give more details. lspci -vv, dmesg, serial console, which version of Dom0, etc.

> Any suggestions?

Couple, but not sure if they apply without the data above.