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Windows 7: DPC Latency causing audio stuttering, crackling

21 Dec 2009   #1

Windows 7
DPC Latency causing audio stuttering, crackling


For the past few days I've been trying to fix the sound stuttering when I'm listening to music, and after monitoring the dpc latency it seems to be caused by a bad driver. I've updated all my drivers and tried finding which one is causing the latency spikes but no luck so far.

DPC latency when i'm not getting stutters:
Yfrog - dpc1

Yfrog - dpc2
Yfrog - dpc3

Also, I don't know if this means anything but when I open up hwinfo32 and the hardware summary is shown, i get this pattern:
Yfrog - hwinfodpc (big screenshot)

When I close the summary it's back to normal. Does this mean it's related to one of the parts shown in the hwinfo32 summary?
I've tried disabling wlan, vga, sound, and modem in device manager, uninstalled daemon tools and it's driver etc, but that didn't change anything.

Any advice?
I'm using an Acer Aspire 5715Z laptop, Realtek HD audio

My System SpecsSystem Spec
21 Dec 2009   #2

Windows 10 64 bit

Uninstall the Realtek in the Device Manager then restart the PC and when Windows starts it will detect it and reinstall. Sometimes the reinstall will put it on a different IRQ and fix the problem. No guarantee but worth a try.

FWIW I have an Acer 7720 laptop with Realtek and Win 7 32 bit and it doesn't do it on mine.
My System SpecsSystem Spec
21 Dec 2009   #3

Windows 7

Just tried that now, still getting huge dpc latency spikes, and audio stuttering because of it.
My System SpecsSystem Spec

20 Jan 2010   #4

Windows 7 Home Premium - 64 Bit

Did you ever get this fixed? I have been getting a lot of high DPC readings which are causing pops and clicks in my audio, too. Below is a link to my post if you want more information.

DPC Latency

I don't think it's an audio driver issue because I've had it with my Creative Labs Xfi and Audio Kontrol interface.
My System SpecsSystem Spec
20 Jan 2010   #5

Windows 7 Ultimate x64 | Windows XP Pro x86 | Windows Vista Ultimate x86

Have the exact same problem.
My System SpecsSystem Spec
21 Jan 2010   #6

Windows 7

somehow I fixed it, but I'm not really sure what caused it. I think it was the daemon tools sptd driver which I uninstalled. when I finally figured out how to use xperf and xperfview, to really get a detailed summary of dpc latency, an 'unknown' driver was at the top, uninstalling the sptd driver that comes with daemon tools seems to have fixed this.
so, my advice is: download xperf & xperfview ( it's in the microsoft windows performance toolkit ) and take a good look at the dpc latency summary, this will tell you exactly what's causing the spikes. there's a really good guide i used, to figure out how to use xperf: Pointless Blathering : Measuring DPC time
also take a look at this topic VIRTUAL DJ SOFTWARE - DPC Latency Questions
My System SpecsSystem Spec
24 Apr 2010   #7

Windows 7 x86

Mostly on laptops it is Power Management causes this problem. It changes processor rate to save the power, and this changing of CPU rate causes increased DPC latency.

Fixing the problem:
Simply you can just create (or modify current) a new special power plan in: Control Panel\Hardware and Sound\Power Options
When you do this, just go to plan settings, click advanced settings, and set the minimum and maximum processor rate to equal (minimum = maximum), so this prevents changing of your CPU speed. Personally, I have 60% in my settings, because listening to music does not require a lot o CPU resources.

Just adjust these minimum/maximum settings anyway you want. Just remember to set them two equally.
You can set 100% (maximum performance) but then your CPU will generate more heat and the fun will be noisy... So just choose the best setting for you.

So static CPU rate should solve high DPC latency and fix the sound crackling problem.. It works for me fine!
My System SpecsSystem Spec
27 Mar 2014   #8

Windows 7 64-BIT

I know this is a 4+ year old thread, I have been/was suffering bad audio stuttering/tearing, it was also noticeable with the mouse/scrolling. It started plaguing me awhile back, then appeared to go away, in the past week or two it has come back.

Just wanted to help out others with this problem, after trying basically everything i could find on various form threads on this issue for example:
Performance power management options
Updating drivers: audio, Ethernet, wireless, sata controller, chipset, video etc
Disabling onboard LAN, removing wireless adapters
Isolating hardware components

I couldn't get rid of this annoying problem, when i thought i had it figured, the minute later it was apparent it wasn't. I did notice that this problem didn't occur on another windows installation on a secondary HDD. I figured its obviously not a hardware fault, it must be some sort of software/driver problem.

I went back to the basics and using DPC latency monitor and device manager to disable components i was able to narrow it down, I have both an onboard ethernet adapter and also a PCIe wireless N adapter.

I believed one of these devices to be problematic, after disabling the wireless N adapter in Device manager, the latency and audio tearing was still there using onboard LAN. I then tried disabling the onboard ethernet and using wireless adapter, the problem still persisted.

However with BOTH disabled, there was no latency, no audio stuttering/tearing etc.
So it was obviously an issue linked with internet connectivity, but the chances of both onboard ethernet and a wireless adapter card being faulty is quite high.

I continued to try basically every little tip/trick that people mentioned, and came across one that worked for me, someone mentioned on another forum that DISABLING windows firewall fixed it for them, and alot of people believe it started happening after windows updates.

I was basically to the end of my wits, trying all these "fixes" that people posted and not doing anything for me, when it finally clicked that i actually enable windows firewall a couple of weeks back (co-inciding when it came back) and that my other windows installation had windows firewall disabled.

As soon as i disabled it, the latency in DPC latency monitor dropped, i've been running for the past 3 hours intensively without 1 latency spike, audio sttuter/tear etc where it would previously spike every 20 seconds or so.

I'm not sure why windows firewall causes this problem, my best guess is its some sort of hardware compaitability conflict, maybe this is why it only happens to a select few? whatever it is if you're experiencing latency spikes with audio stuttering and tearing, i HIGHLY recommend giving this a shot, its much quicker and easier then updating drivers, and if it turns out to not fix your problem, can be easily enabled.

I kept thinking it was a hardware problem (RAM) or driver related, but in the end it was something as simple as windows firewall
My System SpecsSystem Spec
24 Apr 2014   #9

Windows 7 Home Premium 64bit

As with the previous poster I understand this is an old thread but I also have experienced this issue and only just resolved it - and with this being the highest ranked in a Google search it may be the first port of call for others.

My fix:

Using Power Options in Windows 7 I disabled the balanced plan and setup my own disabling sleep parameters and such - not sure which was the exact custom setting that remedied it but I shall take a further look when I get the time.

Hope this helps someone as it was driving me somewhat mad as it only occurred after a reformat and I had no idea why as no hardware or drivers had changed - except I was yet to change the power options settings. The DPC latency (and thus audio interruptions/cracks/pops) dropped dramatically as illustrated below.


Attached Thumbnails
DPC Latency causing audio stuttering, crackling-dpc-latency.jpg  
My System SpecsSystem Spec
27 Sep 2014   #10

Win7 x64

My DPC latency issues were USB related. Luckily I just managed to solve the issues!

Maybe worth mentioning: I tried the maximum Performance settings in the Windows Power Options prior to this and kept those settings, it may or may not be related to how the following finally solved my issues.

ATTENTION: Before you try this method turn on Mouse Keys cursor control in the Windows Ease of Access Center > Make the mouse easier to use settings to be able to move the cursor with the Numblock-Keys and do Mouseklicks with the Numblock-5-Key as long as possible during this solution. If you can't control the cursor later on even though you enabled this try turning Numlock ON or OFF depending on how you set it to be active in the Ease of Access Center settings.

After doing all that in preparation this is how I solved my DPC latency issues:

- Disabled USB Legacy Support + USB WiFi Functions, both in the BIOS
- Uninstalled the USB Host Controllers in the Device Manager (Win7), in my case they're called "Intel(R) ICH8 Family USB Universal Host Controller - 2830", "Intel(R) ICH8 Family USB Universal Host Controller - 2831", "Intel(R) ICH8 Family USB Universal Host Controller - 2832" etc. until I wasn't able to control the Mouse cursor at all anymore, neither via Mouse nor via Numblock Mouse Keys.

Then I simply pressed the Power button on my computer (which is set to Shutdown in the Power Options) and restarted Windows (cancelling as quick as possible the following Windows Startup Repair attempt that followed in my case as soon as I was given mouse control in that interface). After logging in (obviously the USB Controllers have been re-installed during the loading process of Windows so I was able to type in my login password) I checked the DPC Latency with the DPC Latency Checker (large screenshot in the post above) and everything was fine again.

My guess is the USB Host Controllers were issued different IRQ's during the re-installation of themselves and that resolved the issues. If it doesn't instantly work for you you may have to remove the ones you weren't able to remove due to unable to control the cursor anymore. So it might be helpful remembering which ones you removed. I just uninstalled all USB Host Controllers from top to bottom until I lost all control over the cursor both via the Mouse and the Numblock Mouse Keys.

Good luck!
My System SpecsSystem Spec

 DPC Latency causing audio stuttering, crackling

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