Hello, I have just installed Windows 8 on my home HP Microserver. It has AMD n36l CPU. After installation of Hyper-V module my CPU the PowerNow has stopped working. In Control Panel / Power Management I don't see CPU scaling options, and my CPU is still running at highest frequency. When I remove Hyper-V, the changes frequency without any problem. Information exposed to operating system during boot: Processor 0 in group 0 exposes the following power management capabilities: Idle state type: ACPI Idle (C) States (1 state(s)) Performance state type: ACPI Performance (P) / Throttle (T) States Nominal Frequency (MHz): 1300 Maximum performance percentage: 100 Minimum performance percentage: 61 Minimum throttle percentage: 61 Does anybody has similar problem? Is there some workaround? Thank you for any answer Petr Janousek