Unfortunately, it is a known issue. Please see;
http://support.microsoft.com/kb/961661If you are like me, and you use Hyper-V and business applications during the day, and do games and graphics at night, then you can turn Hyper-V on and off. On the other hand, if your workflow is mixed, you will need a different virtualization solution.
When I stop working (around 6PM), I run a batch file that applies the following registery change and shuts down the computer;
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\hvboot]
"Start"=dword:00000003
When I stop non-work (around 11PM), I run a batch file that applies the following registry change and shuts down the computer;
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\hvboot]
"Start"=dword:00000001
Also, make sure you have the latest NVIDIA driver (I am using 190.38). The latest drivers have reduced the usage of the offending feature (and thus improved the performance somewhat). For getting the latest drivers running on your mobile GPU, I strongly recommend;
http://www.laptopvideo2go.com/