From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Console is not working with 2.6.38.4 Dom0 and Xen
	unstable
Date: Tue, 3 May 2011 11:05:18 -0400
Message-ID: <20110503150518.GE7207@dumpdata.com>
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To: Wei Liu <liuw@liuw.name>
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On Tue, May 03, 2011 at 11:28:14AM +0800, Wei Liu wrote:
> On Mon, May 2, 2011 at 10:10 PM, Konrad Rzeszutek Wilk
> <konrad.wilk@oracle.com> wrote:
> > On Mon, May 02, 2011 at 07:31:21PM +0800, Wei Liu wrote:
> >> I test with various command line options, along with Konrad's [1] and
> >> Jeremy's [2] kernel. It's still blank.
> >
> > For the Intel graphic cards to work, you need CONFIG_DMAR to be set.
> > Do you have that?
> >>
> >> Konrad's kernel is 2.6.39-rc4, runs well on bare metal, blank screen
> >> on Xen unstable.
> >
> > I am 99% sure you have forgotten to set CONFIG_DMAR?
> 
> Actually I have set CONFIG_DMAR.
> 
> CONFIG_DMAR=y
> CONFIG_DMAR_DEFAULT_ON=y
> CONFIG_DMAR_FLOPPY_WA=y
> 
> >
> > For that, try 'debug loglevel=8 console=hvc' on your Linux line to make sure that the output
> > is being piped through to the Xen hypervisor.
> >
> > And on the Xen hypervisor do have 'console_to_ring'
> 
> I've added those debugging options in the first place. Here is my
> kernel dmesg output.

Hmm, not seeing the drm messages. Did you compile with the CONFIG_DRM_I915_KMS=y

Also you might want to run with 'drm.debug=255' just to see where it stops working correctly.