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

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Am 21.09.2010 schrieb Konrad Rzeszutek Wilk:
> On Tue, Sep 21, 2010 at 09:19:51AM +0200, Dietmar Hahn wrote:
> > 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? 
> > Yes!
> 
> And if you have VT-d enabled and you don't include the "vga=mode-0x314" then
> it works fine too?

Yes but only the boot process (in default text mode) until the Xserver starts.

> 
> Just curious, but why did you try the 'vga=mode' option?

The vga option gets set somewhere in the installation procedure.

> > 
> > > 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)
> 
> Ugh, that looks nasty.

Yes!

> > dom0 kernel is from SLES11 SP1 2.6.32.12-0.7-xen.
> > 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
> > this.
> > So I hoped anybody on the list could give me a hint while reading the logs 
> > in
> > my original mail ;-)
> > Thanks.
> > 
> > Dietmar.
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