System Interrupts high CPU when any usb device gets plugged in


  1. Posts : 5
    Windows 7 Home Premium 64bit
       #1

    System Interrupts high CPU when any usb device gets plugged in


    Whenever a USB device is plugged into my laptop (any of the USB ports), the CPU usage goes way up. It stays up even when the device is then unplugged, and the only way to bring it back down is to either reboot, or to go into "sleep" (when Windows resumes the problem is gone).

    The Windows 7 resource monitor indicates that the problem is System Interrupts - Deferred Procedure Calls and Interrupt Service Routines. .

    I have updated my drivers for each thing, and that has not helped. Not has lots of Google searches on this problem.

    Running Windows 7 Home Professional 64 bit, on a Toshiba Portege R705-P41.

    Any ideas? Thanks in advance.
      My Computer


  2. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       #2

    A lot of DPCs usually point to a driver problem. Run this program (when the problem occurs) and see whether it gives you any clues. http://www.thesycon.de/eng/latency_check.shtml
      My Computer


  3. Posts : 5
    Windows 7 Home Premium 64bit
    Thread Starter
       #3

    Thanks. I've now done that. However the latency readings are no different whether the problem is occurring or not. I.e. it is mostly in the green (sub-500us), with a single spike to 3000-4000us every 30 seconds.
    Any other thoughts?
      My Computer


  4. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       #4

    Any idea what process could become active every 30 seconds.
      My Computer


  5. Posts : 5
    Windows 7 Home Premium 64bit
    Thread Starter
       #5

    I watched the DPC latency checker as I disabled items in device manager. The FIRST thing I disabled led to no more spikes. It was:
    Intel(R) 82577LC Gigabit Network Connection, under Network adapters.
    I only use wireless as apposed to an ethernet cable, so will just leave it disabled.
      My Computer


  6. Posts : 5
    Windows 7 Home Premium 64bit
    Thread Starter
       #6

    This driver seems to be the source of my other (bigger) problem too. I will update the driver, and if that doesn't work, will leave it disabled.
    Many thanks whs!!
      My Computer


  7. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       #7

    I am glad you are making progress. Is there anything else I can do for you ??
      My Computer


  8. Posts : 5
    Windows 7 Home Premium 64bit
    Thread Starter
       #8

    No, but I'll come back if I have further issues.
    Cheers.
      My Computer


 

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