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

To: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Xen Dom0 console display is scrambled
From: Aidan Wong <awong@xxxxxxx>
Date: Wed, 29 Dec 2010 21:42:45 -0800
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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.

I'd like to try to patch my CentOS Dom0 Xen kernel but exactly sure how, can you provide some pointers?

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:


Perhaps this helps?



> Thank you



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