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Last week, I reinstalled my company laptop, a HP Pavilion dv7-6b22ed. Everything was installed okay, but there is one issue I can't solve: whenever I download a file, be it a several hunderd MB file or a rather big web page, the computer slows down. It expresses itself as stuttering audio, a slow moving mouse pointer and in almost being able to see that screen components are being drawn (e.g.: selections in comboboxes appear one option at a time). As soon as the download finishes, the computer goes back to its regular speed again. I don't have problems with my download speed, which is around 17Mbps over wireless.

I've installed all of the drivers from the HP site (http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=4132&lc=nl&cc=nl&dlc=nl&sw_lang=&product=5191530#N189 - it's a dutch page, because I can't seem to find that make of laptop on HPs site when I have another language) and Windows updates, ran multiple assist tools including HPs Support Assistant and Intel's Driver Update Utility. According to both tools, everything is up-to-date. The only update I could not install is the BIOS update. It results in a blue screen with the error code DRIVER_VERIFIER_DETECTED_VIOLATION, which I assume means that the driver itself is faulty.

It does not seem to be I/O in general: moving several GB of data from my SATA drive to my SSD drive doesn't slow the machine at all.

I don't believe that Windows 8.1 is the culprit, because I had Windows 8 installed before the reinstallation and that worked just fine and without slowing down. I was thinking that it might be the download speed which slows it down, but I don't know hot to throttle it to test that.

How can I fix this problem?

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  • looks like you have DPC issues. Trace them with xperf: msfn.org/board/index.php?showtopic=140263 Aug 10, 2014 at 15:52
  • Looks like a DPC issue with ndis.sys. I've tried installing the Windows 8 drivers on HPs site, but to no avail. The Win7 drivers don't seem to work, either. I've tried uninstalling the wireless driver so I could install it myself, but after a reboot it's back, as if I never removed it. Where do I go from here?
    – user849924
    Aug 11, 2014 at 7:59
  • which network card do you have? Post the HW ID which you can see in device manager. Aug 11, 2014 at 15:50
  • According to Device Manager, I have an Intel Centrino Wireless-N 1030. According to the specs on HPs site: 'Intel 802.11 bgn'. Hardware IDs: PCI\VEN_8086&DEV_008B&SUBSYS_53158086&REV_34, PCI\VEN_8086&DEV_008B&SUBSYS_53158086, PCI\VEN_8086&DEV_008B&CC_028000 and PCI\VEN_8086&DEV_008B&CC_0280.
    – user849924
    Aug 11, 2014 at 16:22
  • get the latest driver from Intel.com (not HP) and look if it fixes the issue Aug 12, 2014 at 4:14

1 Answer 1

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You have activated Driver Verifier and causes this the DPC issues.

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Simply remove it and reboot. The issue should be gone. If you still have spikes, capture and upload a new trace.

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  • Awesome! That worked. How did you figure that out?
    – user849924
    Aug 14, 2014 at 9:02
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    I saw this in the callstack. I highlighted some Driver Verifier calls in the picture. Aug 14, 2014 at 18:42

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