Surface pro 4 - clock speed of CPU keeps the same

Anonymous
2016-08-03T03:19:10+00:00

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?

Surface | Surface Pro | Display and screen

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Anonymous
2016-08-31T01:11:30+00:00

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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  1. Anonymous
    2016-08-20T16:10:24+00:00

    Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power

    Change CsEnabled to 0 (should be previously 1)

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\8baa4a8a-14c6-4451-8e8b-14bdbd197537

    Change Attributes to 0 (should be previously 1)

    Restart and now you should have advanced power settings visible in Power Options > Change Advanced Power Settings. Under Processor Power Management you should now see Processor performance autonomous mode. This should be originally Enabled so change to Disabled.

    This definitely seems to work, but what exactly is "Processor performance autonomous mode" and why is it enabled in the first place?  Google doesn't really come up with anything useful.

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  2. Anonymous
    2016-08-20T08:30:29+00:00

    For those who have applied the registry fix and deemed the issue solved, have you notice any improvements in battery life? After the AU, my SP4 is still getting horrible battery life. Is it too much to ask for a better battery life on this device without resorting to battery saver mode, lowest brightness, wifi off, location and etc.....

    I'm getting around 4-5 hours of battery life on my SP4 i7/8/256, which I think is around the same as it was before the registry fix. Unfortunately the AU wiped the battery stats, so I don't really know whether this is worse than pre-AU, but I suspect that it is.

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  3. Anonymous
    2016-08-20T04:54:26+00:00

    It seems a regedit issue, I got an experimental fix from here(https://www.reddit.com/r/Surface/comments/4wfish/progressfix\_for\_the\_anniversary\_update\_cpu/) and it works fine until now, mine is surface book i5/dgpu/256g, hope it works for you

    For those who have applied the registry fix and deemed the issue solved, have you notice any improvements in battery life? After the AU, my SP4 is still getting horrible battery life. Is it too much to ask for a better battery life on this device without resorting to battery saver mode, lowest brightness, wifi off, location and etc.....

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  4. Anonymous
    2016-08-19T19:06:55+00:00

    Update: 23 Aug - Everything I said before is garbage. Hours later it would reduce CPU speed without being on Battery Saver mode. Then I had two updates today: KB3176934 and KB3176936. After that, CPU stuck again at 2.19GHz.

    I just followed the instructions of f03nix (3 registry changes, reboot, 3 Processor Power Management changes) and now I've seen the CPU step down to 0.82 GHz. What a pain! I guess I need to keep the instructions for the next Windows update?

    Ignore this:

    You must have Battery Saver turned on for the CPU to step down when on battery.

    My Surface Pro 4 Won't Change CPU Speed on Battery

    I reinstalled the OS... worked for a bit, then didn't. For some reason I tried turning on Battery Saver and it stopped showing only 2.19 GHz! And would step down! (And greatly increase my battery life.)

    What is sort of a pain, is that if I plug it back in, then unplug, Battery Saver is turned off. So you need to turn it on every time. It doesn't seem to remember.

    I'm on Windows 10 Pro, Version 1607 with Surface Pro 4 i7-6650U CPU @2.20GHz

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