[Bug 513971] [NEW] AMD-V not available on x86_64

[Tom Judd]

Public bug reported:

Binary package hint: virtualbox-ose

x86_64 Lucid as at 2010-01-27, VirtualBox 3.1.2
If I run a VM containing 64 bit Windows 7, very early in the boot process I get a VirtualBox dialog saying "VT-x/AMD-V hardware acceleration has been enabled, but it is not operational. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot. Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer."
However, if I boot the *same* host computer into i386 Lucid (with -pae kernel) as at same date, same VirtualBox version, the *same* VM boots fine. I have checked the BIOS anyway, and "Virtualization" is enabled. The x86_64 VirtualBox is able to run VMs that don't need a 64-bit CPU.
My CPU is an AMD Athlon 7750. /proc/cpuinfo shows svm in the flags section.
Motherboard is Gigabyte GA-MA78G-DS3H.
Googling suggests that having kvm_amd loaded can cause this, but I don't.

ProblemType: Bug
Architecture: amd64
Date: Thu Jan 28 19:58:11 2010
DistroRelease: Ubuntu 10.04
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100113)
Package: virtualbox-ose-qt 3.1.2-dfsg-1ubuntu1
ProcEnviron:
 PATH=(cususername, no user)
 LANG=en_GB.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-11.15-generic
SourcePackage: virtualbox-ose
Uname: Linux 2.6.32-11-generic x86_64
VirtualBoxOse.DpkgList:
 ii  virtualbox-guest-additions             3.0.10-1                                       guest additions iso image for VirtualBox
 ii  virtualbox-ose                         3.1.2-dfsg-1ubuntu1                            x86 virtualization solution - base binaries
 ii  virtualbox-ose-dkms                    3.1.2-dfsg-1ubuntu1                            x86 virtualization solution - kernel module 
 ii  virtualbox-ose-qt                      3.1.2-dfsg-1ubuntu1                            x86 virtualization solution - Qt based user

** Affects: virtualbox-ose (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

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AMD-V not available on x86_64
https://bugs.launchpad.net/bugs/513971
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