Hello,

I would like to get dual head working with my xen installation -- I have 
two monitors, and my video card supports it (works flawlessly with 
nvidia driver on vanilla kernel). I have an NVidia 9500GT.

[root@localhost ~]# cat /etc/redhat-release
Scientific Linux SL release 5.3 (Boron)
[root@localhost ~]# uname -rmsrv
Linux 2.6.18-128.7.1.el5 #1 SMP Mon Aug 24 08:12:52 EDT 2009 x86_64
[root@localhost ~]# lspci | grep VGA
01:00.0 VGA compatible controller: nVidia Corporation GeForce 9500 GT 
(rev a1)

I managed to get through the installation just fine, but when I restart 
gdm, (gdm-restart) I get no output from the video card and the computer 
is unresponsive - almost as if it crashes. I have to restart the 
computer to get it working.

I've tried to follow these instructions here:
http://kbase.redhat.com/faq/docs/DOC-9724

Thanks,
-Chris Tooley