Intel SpeedStep & TurboBoost stops working when using Hyper-V

Question

Hi guys,
Several times my CPU speed got "stuck", not using SpeedStep or TurboBoost (i5, Ivy Bridge). Finally, I found out it happens when I use Hyper-V. Sometimes, not always. But after the next restart, the CPU won't change the speed anymore. Thus wasting battery and loosing performance. Looks like a bug to me. But if it's Microsoft or Lenovo, who knows...
The event log is as follows:
The speed of Hyper-V logical processor 0 is being limited by system firmware.
- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/ev​ent">
- <System>
<Provider Name="Microsoft-Windows-Kernel-Processor-Power" Guid="{0F67E49F-FE51-4E9F-B490-6F2948CC6027}" />
<EventID>37</EventID>
<Version>1</Version>
<Level>3</Level>
<Task>7</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2013-01-02T04:20:34.648024800Z" />
<EventRecordID>127825</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="3644" />
<Channel>System</Channel>
<Computer>Charly13</Computer>
<Security UserID="S-1-5-18" />
</System>
- <EventData>
<Data Name="Group">0</Data>
<Data Name="Number">0</Data>
<Data Name="CapDurationInSeconds">1</Data>
<Data Name="PpcChanges">2</Data>
<Data Name="TpcChanges">0</Data>
<Data Name="PccChanges">0</Data>
</EventData>
</Event>
If I helped you, please give me some kudos! ^^

Answer 1

Bump? :'(
If I helped you, please give me some kudos! ^^