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After turning on my desktop one day, I found that my CPU usage was maxed out at 100%, with most of that going to hardware "Interrupts":

I tried to enable/disable all my devices one by one through the device manager, and found that I could get the CPU usage used by the Interrupts down to 50% by disabling all devices labelled "USB Host Controller" (except the ones for the mouse/keyboard). I found that I also got 10-20% more from disabling "High Definition Audio Controller".

enter image description here

Following the tutorial at: http://www.msfn.org/board/topic/140263-how-to-get-the-cause-of-high-cpu-usage-by-dpc-interrupt/

Led me to similar conclusions (that is, that the culprit is mostly "USB Host Controller"):

enter image description here

I've tried updating my asus motherboard driver and my video card driver. This is on Windows 7 64 bit.

I've spent hours trying to figure this out and I'm running out of ideas short of formatting (which might still not fix it!).

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  • Can you post screen scap of your Task manager ,showing process running tab ?
    – Desingh
    Commented Apr 8, 2012 at 5:41
  • Ok, I've added screen shot of task manager
    – Steve Vermeulen
    Commented Apr 8, 2012 at 13:22
  • I had this exact issue (usbport.sys HDAudBus.sys interupts) on a PC, never did figure it out. Assumed it was a driver conflict that could not be sorted out, tried everything, XP had no issues on my hardware, only W7....msfn.org/board/topic/…
    – Moab
    Commented Apr 8, 2012 at 15:09

1 Answer 1

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SOLVED!

All I had to do was update BIOS. I was previously still using the initial version that came with my motherboard. In my case I just had to go to the Asus support site, download the latest BIOS, and then follow instructions that I found here to update it from a USB stick.

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