1. #1

    Problem with audio dropouts (probably latency?)

    Hi, i bought new laptop 3 months ago and until then i am fighting with audio dropouts when audio goes through usb audio interface Yamaha mw8cx. So, when audio is reproduced through laptop speaker everything is normal. I also tried different usb audio interface, steinberg ur22 and the dropouts still occurs. It happens no matter if audio is from youtube or my collection. I updated a lot of drivers, adjusted power options,etc. Dropouts are not freaquent, they come every ten minutes(sometimes longer, sometimes shorter).Also intersting is that when i connect my usb audio interface and dont install appropriate drivers, windows has some automatic drivers and i dont have dropouts but then i cant find my usb audio interface in DAW (music production)
    My laptop is HP 470 G3- intel core i5-6200U 2.3 GHz, 8 gb ram, windows 7 professional (service pack 1)
    So here is my latencymon check run for 30 minutes. I didnt updated my BIOS. I hope we will find solution to my problems! Cheers!
    Problem with audio dropouts (probably latency?)-drivers-pngProblem with audio dropouts (probably latency?)-main-screen-jpg
    Your system appears to be having trouble handling real-time audio and other tasks. You are likely to experience buffer underruns appearing as drop outs, clicks or pops. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
    LatencyMon has been analyzing your system for 0:30:57 (h:mm:ss) on all processors.

    Computer name: JENA-HP
    OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x64)
    Hardware: HP ProBook 470 G3, HP, 8102
    CPU: GenuineIntel Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz
    Logical processors: 4
    Processor groups: 1
    RAM: 8088 MB total

    Reported CPU speed: 240 MHz

    Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.

    The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

    Highest measured interrupt to process latency (s): 6804,712018
    Average measured interrupt to process latency (s): 3,610990

    Highest measured interrupt to DPC latency (s): 1184,745158
    Average measured interrupt to DPC latency (s): 0,893192

    Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

    Highest ISR routine execution time (s): 129,949167
    Driver with highest ISR routine execution time: ACPI.sys - ACPI Driver for NT, Microsoft Corporation

    Highest reported total ISR routine time (%): 0,057577
    Driver with highest ISR total time: hal.dll - Hardware Abstraction Layer DLL, Microsoft Corporation

    Total time spent in ISRs (%) 0,061740

    ISR count (execution time <250 s): 3740859
    ISR count (execution time 250-500 s): 0
    ISR count (execution time 500-999 s): 0
    ISR count (execution time 1000-1999 s): 0
    ISR count (execution time 2000-3999 s): 0
    ISR count (execution time >=4000 s): 0

    DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

    Highest DPC routine execution time (s): 1988,303333
    Driver with highest DPC routine execution time: ndis.sys - NDIS 6.20 driver, Microsoft Corporation

    Highest reported total DPC routine time (%): 0,561444
    Driver with highest DPC total execution time: iusb3xhc.sys - Intel(R) USB 3.0 eXtensible Host Controller Driver, Intel Corporation

    Total time spent in DPCs (%) 1,058517

    DPC count (execution time <250 s): 18398703
    DPC count (execution time 250-500 s): 0
    DPC count (execution time 500-999 s): 2203
    DPC count (execution time 1000-1999 s): 26
    DPC count (execution time 2000-3999 s): 0
    DPC count (execution time >=4000 s): 0

    Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.

    NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.

    Process with highest pagefault count: avastsvc.exe

    Total number of hard pagefaults 7749
    Hard pagefault count of hardest hit process: 4491
    Highest hard pagefault resolution time (s): 500128,383333
    Total time spent in hard pagefaults (%): 0,168840
    Number of processes hit: 24

    CPU 0 Interrupt cycle time (s): 62,189731
    CPU 0 ISR highest execution time (s): 129,949167
    CPU 0 ISR total execution time (s): 4,372851
    CPU 0 ISR count: 3721033
    CPU 0 DPC highest execution time (s): 1988,303333
    CPU 0 DPC total execution time (s): 34,343080
    CPU 0 DPC count: 14564113
    CPU 1 Interrupt cycle time (s): 79,638298
    CPU 1 ISR highest execution time (s): 128,604167
    CPU 1 ISR total execution time (s): 0,214925
    CPU 1 ISR count: 19826
    CPU 1 DPC highest execution time (s): 1040,931667
    CPU 1 DPC total execution time (s): 42,646421
    CPU 1 DPC count: 3485525
    CPU 2 Interrupt cycle time (s): 14,167432
    CPU 2 ISR highest execution time (s): 0,0
    CPU 2 ISR total execution time (s): 0,0
    CPU 2 ISR count: 0
    CPU 2 DPC highest execution time (s): 528,6950
    CPU 2 DPC total execution time (s): 0,557264
    CPU 2 DPC count: 117429
    CPU 3 Interrupt cycle time (s): 12,713152
    CPU 3 ISR highest execution time (s): 0,0
    CPU 3 ISR total execution time (s): 0,0
    CPU 3 ISR count: 0
    CPU 3 DPC highest execution time (s): 448,378333
    CPU 3 DPC total execution time (s): 1,109778
    CPU 3 DPC count: 233865

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  2. #2
    xilolee's Avatar
    Join Date
    Dec 2013
    World, Europe, Italy

    Re: Problem with audio dropouts (probably latency?)

    Hi OPTibanez.

    Would you try these steps?


    In case you don't know how to open an elevated command prompt in windows 7, you can use one of these three methods:
    • click start, all programs, accessories, right-click the command prompt in the list and click run as administrator, click yes on the user account control window that should appear
    • click start, type cmd in the searchbox, right-click the cmd in the list of results and click run as administrator, click yes on the user account control window that should appear
    • click start, type cmd in the searchbox, press and keep pressed ctrl + shift Keys on your keyboard, then press enter, click yes on the user account control window that should appear

    1. Left-click on Start, type directly msconfig, press enter.
      Is the radio button on normal startup?
    2. Advanced disk cleanup with cleanmgr:
      • Open an elevated command prompt
      • Type cleanmgr /sageset:1 and press enter.
      • Select all the options, or leave unticked the ones you prefer.
      • Type cleanmgr /sagerun:1 and press enter
      • Let it work till it finishes.
    3. Launch this command from an elevated command prompt:
      sfc /scannow
      If you get the following message:
      Windows Resource Protection found corrupt files but was unable to fix some of them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log
      Read Windows Update Forum Posting Instructions (click) and provide the necessary (and missing) informations to the experts. I.e., you should:
      • export and zip/compress the entire CBS folder on your desktop
      • open a new topic in the windows update sub-forum (in sysnative.com)
      • attach that zipped file to that new topic
      If the CBS compressed folder will be too large, you can check the second post on that thread (to use the sfcfix tool with a script) or you can use a (possibly fast) web service like MS OneDrive, Google Drive, DropBox, Box, Mega, Apple iCloud, Amazon Cloud Drive, and so forth...
      Instead if you get the following messages, go to the next step:
      Windows Resource Protection did not find any integrity violations
      Windows Resource Protection found corrupt files and successfully repaired them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log
    4. Defragment your system drive (using windows default defragmenter). Steps:
      • Open an elevated command prompt
      • Type defrag c: /h and press enter
      • Wait till it finishes
    5. Check your system partition, then post the result here. Steps:
      • Open an elevated command prompt.
      • Type chkdsk c: /b and press enter.
      • You'll get:
        The type of the file system is NTFS.
        Cannot lock current drive.
        Chkdsk cannot run because the volume is in use by another
        process. Would you like to schedule this volume to be
        checked the next time the system restarts? (Y/N)
      • Type Y and press enter.
      • Then restart/reboot and wait till it finishes this check.
      • To find chkdsk result:
        • Open an elevated command prompt
        • Copy/paste this command and press enter:
          wevtutil qe application /c:1 /rd:true  /f:text /q:"*[System[Provider[(@Name='Microsoft-Windows-Wininit')]]]" > "%userprofile%\desktop\ChkDskLOG.txt" & notepad "%userprofile%\desktop\ChkDskLOG.txt"
        • It should create chkdsklog.txt on your desktop and open it: paste its content here.
        • If the command won't work, type eventvwr, press enter, in the event viewer window double-left-click Windows Logs to expand it, left-click Application, double-left-click the information event with source wininit, copy its content and post it here.

    If the problem persists:

    • Please provide answers for (answer the best that you can):
      1. System Manufacturer?
      2. Laptop or Desktop?
      3. Exact model number (if laptop, check label on bottom)
      4. OS ? (Windows 10, 8.1, 8, 7, Vista)
      5. x86 (32bit) or x64 (64bit)?
      6. Service pack?
      7. What was original installed OS on system?
      8. Is the OS an OEM version (came pre-installed on system) or full retail version (YOU purchased it from retailer)?
      9. Age of system? (hardware)
      10. Age of OS installation?
      11. Have you re-installed the OS?
      12. CPU
      13. RAM (brand, model, which slots are you using?)
      14. Video Card
      15. MotherBoard - (if NOT a laptop)
      16. Power Supply - brand & wattage (if laptop, skip this one)
      17. What security software are you using? (Firewall, antivirus, antimalware, antispyware, and so forth)
      18. Are you using proxy, vpn, ipfilters or similar software?
      19. Are you using Disk Image tools? (like daemon tools, alcohol 52% or 120%, virtual CloneDrive, roxio software)
      20. Are you currently under/overclocking? Are there overclocking software installed on your system?

    • Retrieve System Information, using speccy
      1. Download Speccy portable - actual version 1.30.730 (click), unzip/decompress it and put it on your desktop.
      2. When the program opens, it will retrieve some information regarding your system.
      3. Once it's done, select the File menu and choose Publish snapshot. Answer Yes to the confirmation message.
        (Or generate a log in your pc, if you prefer to not publish the snapshot for some reason)
      4. On the next screen that comes up, choose the Copy to Clipboard button and paste this link in your next reply.
        (Or upload here the generated log, in case you didn't publish the snapshot)

    • Facultative System information log (if previous point fails for some obscure reason)
      The following command should be run from an elevated command prompt.
      It should generate a log, named MsInfo.nfo, on your desktop, after some time (few seconds or minutes).
      Read More:
      msinfo32 /nfo msinfo32 /nfo "%userprofile%\desktop\MsInfo.nfo"
      (Then upload it here)

    • Download and install the Windows Performance Toolkit - Windows Assessment and Deployment Kit (Windows ADK) for Windows 8.1 Update - adksetup.exe 1.36MB (click):
      Read More:
      Then open an elevated command prompt (right-click on the windows start button on bottom-left corner, left-click Command Prompt (Admin)) and launch these commands:
      Read More:

      You can also read the original tutorial/guide and its following posts for more informations:

      How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8) (click) (by Niemiro)

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