• May 26, 2017
    This is an alert Alert: Updates for Surface Pro 4 published 5/25/17

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    After you restart your Surface, confirm the updates are installed by going back to Windows Update and selecting Update history.

     

    For details on Surface updates, please check the Surface update history page. 

     

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Surface pro 4 - clock speed of CPU keeps the same

Wind_deliver asked on
After updating to windows 10 (1607), I find that the clock speed of the CPU keeps to be 2.92GHz when plugged, and to be 2.47GHz when using battery. My surface pro 4 has a core i5 CPU. It seems strange because the clock speed of CPU should change with the workload in the Task Manager. Does anyone have the same problem?
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Phynal replied on

Fixed with today's update. Thanks, MS!

NOTE: I had to reboot twice after updating. So if anyone is not seeing the fix try a restart.

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f03nix replied on

Is it possible to summarize in easy to follow steps for the less technical amongst us, the proposed "solution", please

The easy way is to reset Speed Shift to use the default values recommended by Intel and execute the following commands with administrative privileges:

powercfg –setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 54533251-82be-4824-96c1-47b60b740d00 36687f9e-e3a5-4dbf-b1dc-15eb381c6863 50
powercfg –setdcvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 54533251-82be-4824-96c1-47b60b740d00 36687f9e-e3a5-4dbf-b1dc-15eb381c6863 50
powercfg –setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 54533251-82be-4824-96c1-47b60b740d00 cfeda3d0-7697-4566-a922-a9086cd49dfa 0
powercfg –setdcvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 54533251-82be-4824-96c1-47b60b740d00 cfeda3d0-7697-4566-a922-a9086cd49dfa 0

Alternatively you can disable Speed Shift by executing:

powercfg –setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 54533251-82be-4824-96c1-47b60b740d00 8baa4a8a-14c6-4451-8e8b-14bdbd197537 0
powercfg –setdcvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 54533251-82be-4824-96c1-47b60b740d00 8baa4a8a-14c6-4451-8e8b-14bdbd197537 0

If you prefer GUI over command line, you can save the following as .reg file and add it to your registry:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\8baa4a8a-14c6-4451-8e8b-14bdbd197537]
"Attributes"=dword:00000002

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\36687f9e-e3a5-4dbf-b1dc-15eb381c6863]
"Attributes"=dword:00000002

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\cfeda3d0-7697-4566-a922-a9086cd49dfa]
"Attributes"=dword:00000002

After rebooting you can see 3 new options under Settings > System > Power & sleep > Additional power settings > Change plan settings > Change advanced power settings > Processor power management

  • Processor energy performance preference policy
  • Processor performance autonomous mode
  • Processor autonomous activity window

To setup Speed Shift with Intel default values change "Processor energy performance preference policy" to 50 and "Processor autonomous activity window" to 0 or disable Speed Shift with "Processor performance autonomous mode".

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