id summary reporter owner description type status component version resolution keywords cc guest host 6577 Synthetic CPU setting ignored => Fixed in SVN Benjamin Gilbert "After I enable the Synthetic CPU option on a VM using IMachine.setCpuProperty(), VBoxManage properly reports that Synthetic CPU is enabled, but /proc/cpuinfo in the guest does not change. The reason appears to be that Console::configConstructor() places the CFGM node at /SyntheticCpu, but CPUM expects the node at /CPUM/SyntheticCpu. Adding an !ExtraData key to the machine configuration: VBoxInternal/CPUM/SyntheticCpu -> 1 indeed causes the guest's /proc/cpuinfo to report the synthetic CPU." defect closed VM control VirtualBox 3.1.6 fixed other other