Ralph Angenendt wrote:

Here's what I already tried, all without success:
* installed a minimal 5.1
* updated the 5.1 with yum update


That should work. Only the 5.2 install kernel has those issues, current 
kernels (should) work.

Unfortuantely that _doesn't_ work with a plain 5.1.
Adding the following to the things I tried without success:
* installed the kernel-xen from http://people.redhat.com/dzickus/el5/128.el5/x86_64/
* updated the minimal 5.1 installation to 5.2 with yum update
and booted the 128 kernel from dzickus

Regards
Michael

-- 
Michael Kress, kress@hal.saar.de
http://www.michael-kress.de / http://kress.net
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