Thank you for the hint. I compiled the kernel with the vga patch and now I can 
see the text on the console.
BTW, I looking for a pciback patch for 3.0. Does someone know, if a patch is 
available?
Am 30.06.2011 um 01:17 schrieb Sven Köhler:
> Am 29.06.2011 16:23, schrieb Christian Motschke:
>> Hello,
>> 
>> I compiled a 3.0-rc5 kernel from debian experimental and tried it to boot as 
>> dom0. After scrubbing RAM the screen goes black and nothing else happens 
>> anymore. The kernel boots without hypervisor and even as domU without 
>> problems.
>> All other kernels I have tested up to 2.6.39 works flawless with 4.0.1 (but 
>> 2.6.39 lacks blkback, thats why I want to try 3.0). Does Linux 3.0 needs XEN 
>> 4.1 or should it basically run with 4.0.1?
>
> It's a known problem. Some patches to make the VGA text console work
> didn't make it into Linux 3.0. Also see
> http://wiki.xensource.com/xenwiki/XenParavirtOps 
> (scroll to the bottom)
>
>
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