pm-suspend no working in OpenSUSE11.1 as dom0 ...

Hello Friends:

I use OpenSUSE11.1 as the dom0 XEN host for dumU guests.
The 64bit kernel I’m running is as follows:

nmvega@linux-5xhv$ uname -a
Linux linux-5xhv #1 SMP 2009-08-15 17:53:59 +0200 x86_64 x86_64 x86_64 GNU/Linux

I’m not sure why, but “pm-suspend” is not working to suspend
my environment. I don’t know if that is possible in a dom0/XEN
context, but if it is, can someone give me some pointers
as to what might be wrong. Or perhaps provide an alternative
means of suspending, if “pm-suspend” does not support dom0.

The machine type, by the way, is a Dell XPS720

Thanks & Regards,