id summary reporter owner description type status component version resolution keywords cc guest host 2968 Unable to start second virtual machine with AMD-V virtualization disabled Samus_Aran "When attempting to run two virtual machines with AMD-V *disabled* I am presented the following message: ""An active VM already uses AMD-V hardware acceleration. It is not allowed to simultaneously use software virtualization."" This message appears to be false, as both virtual machines have AMD-V disabled. The only option which has been set under ""Settings > General > Advanced > Extended Features"" is ""Enable ACPI"", all others (including ""Enable VT-x/AMD-V"") are unchecked. With AMD-V enabled in both virtual machines, I am able to load both simultaneously. This is opposite behaviour as compared to VirtualBox 2.0.6, wherein I was *unable* to load the second virtual machine with AMD-V enabled, receiving the same message as above: ""An active VM already uses AMD-V hardware acceleration. It is not allowed to simultaneously use software virtualization.""" defect closed VMM/HWACCM VirtualBox 2.1.0 fixed virtualisation virtualization AMD-V virtualbox@… other Linux