Short version: Disabling the AMD-V virtualization support in the BIOS (AMD equivalent of VT-X) actually enables it, and enabling it disables it. Way to go, Lenovo. (May not affect newer BIOS versions, I'm running HRET24WW (version 1.12), but haven't upgraded as this BIOS is patched to remove the wifi whitelist (another pointless annoyance IMO, should be an option to allow "unauthorised" cards!).
Lost 4 hours yesterday trying to figure out the answer to this one. Hopefully this saves someone else that time!
