Just found out that if you are running Windows 8 with the Hyper-V Platform installed, some important settings in your “Processor Power Management” section under Power Options go missing. This is because Hyper-V decides to keep your CPU clocked at 100%.
This is obviously bad if you’re on a laptop, since your CPU will no longer clock itself down when not in use, and your battery will drain considerably faster.
Unfortunately, the only way to re-enable power management for your CPU is to uninstall the Hyper-V Platform from the OS. More of a reason for me to keep using VMware then…
You can always change power plan manually by clicking on you battery icon in tray.
The problem is that the power plan change won’t have an effect on your CPU clocking. When Hyper-V role is installed, Windows will force 100% CPU clock no matter what power plan you choose. I’m guessing this is for better performance on your VM’s?