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

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0 screen
From: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Date: Wed, 22 Sep 2010 15:06:14 +0200
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Delivery-date: Wed, 22 Sep 2010 06:07:02 -0700
Dkim-signature: v=1; a=rsa-sha256; c=simple/simple; d=ts.fujitsu.com; i=dietmar.hahn@xxxxxxxxxxxxxx; q=dns/txt; s=s1536b; t=1285160791; x=1316696791; h=from:to:subject:date:references:in-reply-to:cc: mime-version:content-transfer-encoding:message-id; z=From:=20Dietmar=20Hahn=20<dietmar.hahn@xxxxxxxxxxxxxx> |To:=20xen-devel@xxxxxxxxxxxxxxxxxxx|Subject:=20Re:=20[Xe n-devel]=20Problem:=20Pattern=20with=20vertical=20colored =20lines=20on=20the=20dom0=20screen|Date:=20Wed,=2022=20S ep=202010=2015:06:14=20+0200|References:=20<201009171520. 11903.dietmar.hahn@xxxxxxxxxxxxxx>=20<201009210919.51666. dietmar.hahn@xxxxxxxxxxxxxx>=20<20100921144250.GC2926@dum pdata.com>|In-Reply-To:=20<20100921144250.GC2926@dumpdata .com>|Cc:=20Konrad=20Rzeszutek=20Wilk=20<konrad.wilk@orac le.com>|MIME-Version:=201.0|Content-Transfer-Encoding:=20 7bit|Message-Id:=20<201009221506.14610.dietmar.hahn@xxxxx jitsu.com>; bh=xPrnLhlbaVmZnh44DhBVhaYpfEXVpSAl3faQg/W5Ok8=; b=MEAAN2FpY6dV59FwxTdujlDx8ps7n/lWVuBCV9dQbmTGqGLUQe5z/R1m JPpbobjStVjCPU3xoWl2O1Vqp3ObVSnULUszCYCAg/YqSsOfyiOK+mOhr ei28J3JT+DnN8KMQyuoM4x7Y2D98Yl2kelBnmEmD2InzxuzNVpZsbq+XE 9/eEVOtN0iZ+u3FFR9SXzz0Rf1Mhdsv1iWlV1fmec9Z3bT2uGm217nypu AdBppaPUMlQCObeNmb5TUXvwNBVeT;
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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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