8.0-BETA1 on a HP DL585 Issues

I've upgraded one of our HP DL585's (4xdual core opteron, 16GB ram)
from 7.2 to 8.0-BETA1 and seem to have a couple of issues.

Firstly the machine will no longer shutdown or reboot, it just sits at
the Uptime:: XXXX prompt and doesn't reboot or power off, no
Rebooting/cpu_reset() messages.

Secondly, sometimes the machine will not boot, it'll load the kernel
and start, but then hang at:
pcib0: <ACPI Host-PCI bridge> on acpi0

The same seems to happen with GENERIC and a kernel config minus
witness etc for speed.

If I revert to the 7.2 kernel it's fine.

Any suggestions on things I can try?

Full dmesg attached.

Thanks,
Andrew