the new drivers ( 13.2.1.5 ) didn't solve the DCP latency spikes problem on 3945ABG and Windows 7, screenshots included:

with wifi adapter disabled in device manager:

http://imgur.com/6V07x.png

adapter enabled:

http://imgur.com/iSrcZ.png

after some time it get's like this (latency up to over 7000) - these drivers are unusable!!!!

http://imgur.com/3PCLG.png

Hello everyone,

I had audio glitches on my Lenovo T61 too and spent a lot of time to figure out what the problem could be. I posted my solution in Lenovo forum (http://forums.lenovo.com/t5/T61-and-prior-T-series-ThinkPad/Audio-stutter-on-T61p/m-p/243913#M49612), but I will do it here again, maybe it helps some other guys.

I recognized the problem when I was surfing in www using wlan, but in my case it was neither the wlan dirver (intel agn4965) nor the nvidia driver (NVS 140). But it was / is the network driver from intel for the network chip 82566MM, here are my hardware/software details:

OS: Windows XP Professional 32bit

WLAN-Driver: 13.2.0.30 (18.03.2010)

LAN-Driver: 9.13.41.0 (26.03.2010)

Laptop: Lenovo T61

The solution:

I used DPC Latency Checker to fugure out which hardware causes the audio glitches and after deaktivating the intel network card the audio glitches were gone. As I did not want to disable the network card every time when surfing with wlan I did as well a deeper look into the driver setting of the network card and found out, that the energy settings caused the problem!

There is a tab for energy settings in the network driver where it is possible to "reduce energy if cable is not plugged". This option was enabled (I think this was the default of setup) and when I disabled this option (and save klicking OK-Button) all the audiogliches were gone beacuse there were no more DPCs. :-)

Here is what I did in summary:

- Go to the device manager (hardware manager) and select the settings of the network card

- select the tab for energy settings

- uncheck the option "reduce energy if cable is not plugged"

- apply changes and see if DPCs are gone

Hope this helps

KingTutt

KingTutt, maybe you didn't notice but the title is for Win 7 x64, not Win XP 32 bit.

So I tried your solution and here are my results:

1)  There is no tab in win 7 for energy settings but there is one for power management

2)  There is no option called "reduce energy if cable is not plugged" but instead is just the "allow the computer to turn off this device to save power"

3)  I unchecked "allow the computer to turn off this device to save power" hit ok, etc.

Nothing.  Still the same DPC peaks every 10 seconds. 

Thanks for trying but unless I missed something, that is not a solution for win7 x64.

Hello Robert,

of cause I noticed that the title is for Win 7 x64, not Win XP 32 bit. That is why I explicitely mentioned my operating system and said "maybe it helps". Last week I set up a new operating system (Windows 7 64bit Enterprise) on a new SSD-Disk and on that system I counld not recognize DPCs although the rest of the hardware is (of cause) the same.

But I will see if I can reproduce this problem on my Windows 7 system as well and if so I will come back. At the moment I can _not_ confirm that on Windows 7 although I had this problem using Windows XP.

Thanks for trying to help, but this doesn't work for me as too. I'm using Windows 7 x64 and Atheros Lan adapter and disabling this "power saving" feature haven't helped - I still get the latency spikes every 10 seconds

First I want to say thank you to all of you who have included great detail on this issue. We are researching the issue and have been able to reproduce it thanks to the level of detail in this thread. If you can include your OS, wireless product (4965, 5300, etc.) and driver version in your post as well as any troubleshooting you've done and the results.

When we have more information available I'll be sure to add it to the thread.

Keep up the good work!

Ilenek

Intel Customer Support

Make/Model Laptop:  Lenovo T61p

Product:  4965AGN

OS:  Windows 7 Professional x64

Driver Version:  13.2.1.5 (5/31/2010)

Problem:  High DPC spikes every 10 seconds resulting in glitchy audio (buffer underruns) and other IO glitches

Tests done:  Disabled Wireless driver - DPC spikes go away and audio is normal, re-enabled and DPC spikes come back and audio glitches again.

Make/Model Laptop: Asus F3SG

Product:  3945ABG

OS:  Windows 7 Professional x64

Driver Version: 13.2.1.5  (5/31/2010)

Problem:  High DPC spikes every 10 seconds resulting in glitchy audio

Tests done:  Disabled Wireless driver - DPC spikes go away and audio is normal, re-enabled and DPC spikes come back and audio glitches again.

adapter disabled: http://imgur.com/6V07x.png

adapter enabled: http://imgur.com/iSrcZ.png (it tends to get worse over time)

Hello,

today I found the time to install further drivers on my new system (Windows 7 Enterprise 64bit) and now I can confirm the DPS's on my new system as well.

OS: Windows 7 Enterprise 64bit

WLAN-Driver: 13.2.0.30 (18.03.2010)

LAN-Driver: 9.13.4.10 (26.03.209)

Laptop: Lenovo T61

Disabling the enery settings in network does not work as mentioned by Robert Green but diabling the Wireless Adapter!

I will now download the latest drivers from Intel Homepage, the mentioned one above are provided from Lenovo for this Laptop on their homepage.

Here are some screenshots:

WLAN Adapter disabled:

http://imgur.com/6SMtJ

WLAN Adapter enabled:

http://imgur.com/2heuu

King Regards

KingTutt

Driver Update:

Installing the latest wlan driver form Intel Homepage (Version 13.2.1.5) did _not_ solve the problem. I installed as well the latest driver for network card 82566MM  from Intel Homepage (9.13.41.0) but disabling the setting "reduce energy if cable is not plugged" did not solve the problem as well.

@Robert Green:

>There is no option called "reduce energy if cable is not plugged"

This setting is only available if you install the driver from Intel Homepage. If you just install the driver provided from Lenovo you will _not_ find this option.

Hello,

I have been trying to find a solution for my bad ping (mostly noticable when playing online games, e.g. Battlefield: Bad Company 2)

My first thoughts included: interference, problems at the ISP and other stuff that could cause latency problems.

With some more tests (moving my wireless router into close range etc.), I still had problems. So started a second test on a secondary notebook.

I pinged the same IP adres on both machines (both via WLAN) and came to the conclusion that it was the machine that was causing the problems, because the secondary machine didn't have strange latency.

So with the help of the internet I ended here

My machine: Acer Aspire 6935G-844G32BN

Product: Intel® WiFi Link 5100

OS: Windows 7 Professional x64

Driver version: 13.2.1.5

Problem: Just like others, every 10-15 seconds a latency spike causing bad lag during online games

Tests done: Cross referenced the ping results between 2 laptops, one with Intel Wifi Link 5100, one without. Same location, same IP adres.

I hope a solution can be found

Yeah, Seismic, I think that your problem does not related to ours, but I could be mistaken. We are experiencing audio glitches and not spike lags. Please post some screens with DPC Latency Checker running.

If I'm correct the opening post states that he/she has:

Fjtorsol wrote:

 

high DPC Latencies with an interval of 10 micro-seconds and eventual very high DPC Latencies causing audio glitches with a length of up to one second

I too have high DPC latencies but it results in something entirely different, so although my problem doesn't sync with the thread name, whats causing it is completely the same.

Here are the screenshots you asked for:

This one is with wireless: http://imgur.com/ygTDW

This one is with lan (wireless disabled): http://imgur.com/RQsu9

Using lan when wireless is enabled is causing latency aswell.

Hope this explains why I replied in this thread

Having the same problem. Here's my info:

Machine: HP Pavilion Dv9700

OS: Windows 7 Professional x64

Wireless Adaptor: Intel Wireless WiFi Link 4965AGN

Driver Version: 13.2.1.5 (31-05-2010)

Issue: High latency when the Wireless Adaptor is active and audio glitches.

Troubleshooting done: Using DPC Latency Checker, and deactivating the Wireless Adaptor, all the latency disapears (goes to "green zone") and the audio works perfectly (but internet access is gone). When reactivating the Wireless Adaptor, everything is back to the issue discribed.