VBox 3.1.4 OSE on Ubuntu 10.4 multi-CPU/AMD-V problem

[sdavmor]

Hardware: AMD Phenom 4 core processor, 8gb ram. Gigabyte motherboard
< a year old (GA-MA790X-DS4).  Hardware virtualization switches are
"on". Running the 2.6.32-19-generic kernel on a fully up to date Lucid
Lynx (as of this morning). I can start my VBox 3.1.4 in single core
mode after disabling AMD-V.

VirtualBox - Error
Failed to start the virtual machine Win2KOEM.
AMD-V is being used by another hypervisor. (VERR_SVM_IN_USE).
VirtualBox can't enable the AMD-V extension. Please disable the KVM
kernel extension, recompile your kernel and reboot (VERR_SVM_IN_USE).

Details
Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {6375231a-c17c-464b-92cb-ae9e128d71c3}

I do not have another hypervisor running. VBox is the only virtual
machine I've ever used on this computer. I've checked in synaptic --
no KVM or QEMU or VMWARE in use.

Any constructive thoughts?
-- 
Cheers, SDM -- a 21st Century Schizoid Man
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