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Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0 screen
From: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Date: Tue, 21 Sep 2010 09:19:51 +0200
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
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Am 20.09.2010 schrieb Konrad Rzeszutek Wilk:
> On Fri, Sep 17, 2010 at 03:20:11PM +0200, Dietmar Hahn wrote:
> > Hi list,
> > 
> > I have a problem with a new laptop (reproducable on other machines too) and 
> > the
> > xen hypervisor.
> > When the hypervisor gets booted with VESA mode 800x600 I see some messages 
> > and
> > then the screen contents is switched into a pattern of vertical colored 
> > lines
> > and never comes back.
> > In text mode all works well, but later the pattern appears when the X 
> > servers
> > starts.
> > I disabled VTd in the bios and now all went fine.
> So no VT-d and the you have no trouble even with VESA 800x600? 

> Are there any
> errors reported by Xen when you use VT-d?
In the original mail I sent the full hypervisor log from the error case (VT-d
switched on). I couldn't spot an error message.

> Can you ping the machine even
> if the screen is showing vertical lines?
Yes the machine runs well. I can work remotely. Only the console is affected.

> > I saw this first with SLES11 SP1 but could reproduce it with the 
> > xen-unstable
> > hypervisor.
> What about the Linux kernel? Is this happening when you use the PVOPS kernel?
I didn't try this out because at the end I could reproduce this behaviour while
booting the hypervisor and before dom0 starts.
Another thing is when starting the X server I see kernel messages in a loop:
[ 1193.549808] [drm:i915_hangcheck_elapsed] ERROR Hangcheck timer elapsed... 
GPU hung
[ 1193.572464] render error detected, EIR: 0x00000000
[ 1193.586720] i915: Waking up sleeping processes
[ 1193.600679] [drm:i915_do_wait_request] ERROR i915_do_wait_request returns -5 
(awaiting 1 at 0)
dom0 kernel is from SLES11 SP1
As in the orignal mail mentioned I would assume it's a problem with the bios
and maybe some access stuff due to the iommu. But I'am not familiar enough with
So I hoped anybody on the list could give me a hint while reading the logs in
my original mail ;-)


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