CPU load high when docked

Discussion in 'Microsoft Surface Pro 3' started by mrphysics, Jan 7, 2015.

  1. mrphysics

    mrphysics New Member

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    I have noticed an odd behaviour when my SP3 (I5, 256) is docked. Task Manager reports System consuming ~ 13% and System Interrupts consuming ~ 8% of CPU resources while idol. MS has replaced my dock once and I'm on my second SP3 now and the issue seems to be remaining.

    CPU load doesn't fall below ~ 21% while docked but will drop to 0% when not docked.

    It doesn't seem to matter if the dock has any peripherals attached or only just the power adapter.

    Docked CPU Usage
    docked.jpg

    Un-docked CPU load undocked.jpg
    Has anyone else come across this? Any ideas?

    Obviously this becomes an issue when I'm taxing the SP while docked because it is already at 21% and program loads cause the unit to get hot, increase fan use/noise and cause CPU throttling.
     
  2. jnjroach

    jnjroach Administrator Staff Member

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    Have you updated the Firmware while the device is docked? There was an update for this issue a couple a months ago...
     
  3. Caesar

    Caesar New Member

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    What you describe is a feature from Microsoft. The forums are full of the description of the high CPU load from system interrupt.
    Microsoft is ignoring this problem!

    My solution: Every day i'm starting my Surface twice: First start inclusive login, then restart. After restarting the system interrupt CPU load is 0%. It is boring to start every day two times. But this is a Microsoft feature. Thank you Microsoft.
    Some user say it is a problem with the audio driver. Starting any musicplayer "solves" the problem.

    Here you can read one of the forum threads: http://answers.microsoft.com/en-us/...-sysytem/d17d1332-3c00-402d-9f15-fecee27d1c45
     
  4. mrphysics

    mrphysics New Member

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    This was one of the first things I checked with both units.
    All Firmware updates have been applied.
     
  5. mrphysics

    mrphysics New Member

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    Thanks for the info. I did come across that discussion previously and tried some of the suggestions (play an audio file, update the Realtek driver) all with no improvement.

    I just tried a cold boot (computer was off last night) and the CPU load was the usual high, but did your Restart vs. Shut Down and it seems OK. I'll try this again a few times to see what happens.

    As it only happens while docked, there clearly is an issue somewhere.
     
  6. ChrisPanzer

    ChrisPanzer Active Member

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    Good thing our sp3s restart so quickly. The Dell standard pcs in my office take FOREVER to restart. A shameful reminder of our mechanized past...
     
  7. Relativity

    Relativity Member

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    I have exact problem on my SP3 and SP3 Docking Station. Yes, The double reboot does solve the problem , or if you let it boot up to Windows 10 before docking seems to work too
     
  8. ZorMi

    ZorMi Member

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    The same problem with an attached USB hub+Ethernet adapter, no dock.
     
  9. Relativity

    Relativity Member

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    I found this notification of an update for Surface Pro 3 machines...but I have not yet received this update on my machine. Not sure if "Surface Dock" is the same as the "Surface Pro 3 Docking Station" because I notice they sell a different one.

    EDIT: It appears the new "Surface Dock" design is for a Surface universal dock, no longer does it have the slide in/out cradle to fit the Surface.

    Microsoft has a firmware update for April 2016:

    Microsoft driver update for Surface Dock Firmware Update
    Microsoft driver update for Surface Dock Integration
    • Surface Dock Integration driver update (v1.0.6.0) improves stability and compatibility with external monitors and passive video adapters.
    • Surface Dock Firmware Update (v.1.2.6.0) improves stability and compatibility with external monitors and passive video adapters.

    Here is the link to this page:
    Microsoft Surface Pro 3 update history | Surface firmware updates
     
    Last edited: May 29, 2016
  10. Relativity

    Relativity Member

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    Double reboots was the only solution I found, until I read another pointing to the "Hey Cortana" option. I have Cortana disabled by default. I turned it on, and enabled the "Hey Cortana" option. The CPU usage goes down. As soon as you disable the "Hey Cortana" option, CPU usage goes up again.

    update -- the problem is with the "Realtek High Definition Audio" Microphone Array. If you boot up in the dock, or with any USB device connected AND your Microphone Array is not being used , you will see high CPU usage in System Interrupts and System & Compressed Memory. If the Microphone Array is active at boot time, you will not see abnormal CPU usage with System Interrupts and System and Compressed Memory. Enabling "Hey Cortana" turns the microphone on all the time, so this is why this works! I've also noticed returning out of sleep mode causes the higher cpu usage.
     
    Last edited: Aug 2, 2016

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