1. jywang's Avatar
    Installing Visual Studio 2013 with Phone SDK will cause Hyper-V to be installed which in turn disables the ability for CPU to run at a lower frequency. I manually turned-off Hyper-V after installing Visual Studio. You won't be able to use Windows Phone emulation while disabled but it allows the CPU to run at lowered frequency.
    11-04-2013 12:36 AM
  2. vipkl's Avatar
    Interesting, does the same thing happen if I simply install Hyper-V from Windows Features ("Turn Windows features on or off")? Or would I need to actually create and run a VM to be affected by this bug?

    I assume it is a bug that will be fixed in the future, and not by design?
    11-04-2013 01:24 AM
  3. azcruz's Avatar
    How can enabling Hyper-V a bug?
    11-04-2013 02:26 AM
  4. jywang's Avatar
    Just installed affects CPU speed.
    11-04-2013 01:23 PM
  5. chfhyh's Avatar
    Interesting, at what frequency your CPU is running.. It is hard to believe Hyper-V would affect CPU just by installing it. do you have a source for this claim?

    Installing Visual Studio 2013 with Phone SDK will cause Hyper-V to be installed which in turn disables the ability for CPU to run at a lower frequency. I manually turned-off Hyper-V after installing Visual Studio. You won't be able to use Windows Phone emulation while disabled but it allows the CPU to run at lowered frequency.
    11-04-2013 02:29 PM
  6. jhoff80's Avatar
    My understanding is that it doesn't actually change the CPU speed, but changes the reporting. (I could definitely be wrong on this though). Basically though, I think it basically abstracts the CPU from the OS, and then both the host OS and client OS only see a virtual CPU.
    11-04-2013 03:27 PM
  7. vipkl's Avatar
    Confirmed removing Hyper-V brought back the minimum/maximum processor state power management settings (under CP > Power Options > Changed advanced power settings > Processor power management).

    With it installed, I did notice that the SP2 battery life seemed to have run down quicker.

    Also discussed here (see 2nd page of that thread).
    11-04-2013 08:22 PM
  8. azcruz's Avatar
    Why would anybody run virtualization on low processor speed is beyond me.
    11-04-2013 09:13 PM

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