Re: [Xen-users] Xen Dom0 console display is scrambled

[Aidan Wong <awong@xxxxxxx>]

Hi Dietmar,

It's fixed.  I did as you suggested and added vga=ask and select a mode but that didn't work.  I went and updated my BIOS and voila.  Re-enabling "Intel Virtualization Technology" in my BIOS also works, no more scrambling scrolling display in Dom0 console.

Thanks

On Mon, Jan 3, 2011 at 1:04 AM, Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> wrote:

Am 30.12.2010 schrieb "Aidan Wong <awong@xxxxxxx>":

> Hi Dietmar,

>

> Thanks for replying

>

> The user seems to be using X which I'm not even using. The user apparently

> uses a newer version of Xen than I do, but prior to posting my problem, I've

> used a PVOPS kernel and Xen version 3.4.3 and version 4.0.1 directly from

> Xen. I restarted from scratch and now use the CentOS / RH built Xen kernel

> and Xen 3.1.2 which is also RH maintained.

> I tried disabing "Intel Virtualization Technology" (which is Vt-d, I

> think...) in my BIOS setting but that didn't work, I'm still getting the

> scrolling colorful garbage on the Dom0 console.

OK, then your problem seems to be another one because the mentioned problem

was only seen with Vt-d enabled - the real cause was a buggy bios and a

workaround was done in the hypervisor.

>

> I'd like to try to patch my CentOS Dom0 Xen kernel but exactly sure how, can

> you provide some pointers?

Maybe you can try not to use a graphics mode for dom0 console. I mean, try to add

vga=ask in the boot line (grub.conf) and select an ascii mode.

Dietmar.

>

>

> Thank you

>

>

> On Tue, Dec 28, 2010 at 10:29 PM, Dietmar Hahn

> <dietmar.hahn@xxxxxxxxxxxxxx>wrote:

>

> > Hi Aidan,

> >

> > Am 29.12.2010 schrieb "Aidan Wong <awong@xxxxxxx>":

> >

> > > Hi,

> >

> > >

> >

> > > I just install xen and kernel-xen version 2.6.18-194.26.1.el5xen, booting

> >

> > > into the xen kernel dom0 shows me continous colorful scrambling and

> >

> > > scrolling.

> >

> > > I can ssh to dom0 and get correct display but the dom0 console is where

> > it

> >

> > > shows the colorful garbage scrolling.

> >

> > > i have the Supermicro X7DC motherboard with a XGI Z9 graphics card.

> >

> > > GUI is not installed and I don't have the rhgb parameter in my

> > grub.conf.

> >

> > > My grub.conf is plain and unmodified.

> >

> > >

> >

> > > #boot=/dev/md0

> >

> > > default=0

> >

> > > timeout=5

> >

> > > splashimage=(hd0,0)/grub/splash.xpm.gz

> >

> > > hiddenmenu

> >

> > > title CentOS (2.6.18-194.26.1.el5xen)

> >

> > > root (hd0,0)

> >

> > > kernel /xen.gz-2.6.18-194.26.1.el5

> >

> > > module /vmlinuz-2.6.18-194.26.1.el5xen ro root=/dev/VG_ROOT/LV_ROOT

> >

> > > module /initrd-2.6.18-194.26.1.el5xen.img

> >

> > > title CentOS (2.6.18-194.26.1.el5)

> >

> > > root (hd0,0)

> >

> > > kernel /vmlinuz-2.6.18-194.26.1.el5 ro root=/dev/VG_ROOT/LV_ROOT

> >

> > > initrd /initrd-2.6.18-194.26.1.el5.img

> >

> > > title CentOS (2.6.18-194.el5)

> >

> > > root (hd0,0)

> >

> > > kernel /vmlinuz-2.6.18-194.el5 ro root=/dev/VG_ROOT/LV_ROOT

> >

> > > initrd /initrd-2.6.18-194.el5.img

> >

> > >

> >

> > >

> >

> > > Tried adding the "vga=<vesa mode>" parameter in grub for the Xen kernel,

> > but

> >

> > > that didn't work.

> >

> > >

> >

> > > I also ran into this thread

> >

> > > http://lists.xensource.com/archives/html/xen-api/2010-06/msg00015.html

> >

> > > But that didn¹t help.

> >

> > >

> >

> > > Can someone help?

> >

> > There was a discussion on xen-devel with a similar problem:

> >

> > http://lists.xensource.com/archives/html/xen-devel/2010-09/msg01112.html

> >

> > Perhaps this helps?

> >

> > Dietmar.

> >

> > >

> >

> > > Thank you

>

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