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Intel WifiLink 4965 AGN Driver's DPC Latencies causing audio glitches in Windows 7 X64 (RTM)

idata
Employee
19,109 Views

After many tests I can ensure that the wireles adapter Intel WifiLink 4965 AGN is causing high DPC Latencies with an interval of 10 micro-seconds in Windows 7 64 bit (Release to Manufacturer). I have tried the latest drivers for Windows Vista 64 bit (12.4.3.9) and Microsoft's drivers included in Windows 7 with the same results: 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. Is there any specific driver for Windows 7 64 bit (Release to Manufacturer) that solves this issue?? Will there be??

110 Replies
idata
Employee
1,778 Views

Windows 7 updated drivers are not available trough Windows Update as it's said in http://www.intel.com/support/wireless/wlan/sb/CS-030472.htm http://www.intel.com/support/wireless/wlan/sb/CS-030472.htm but Windows 7 (RTM) has already been released and launched. Do I have to buy an atheros wireless adapter to properly run Windows 7 and use my wireless connections??

idata
Employee
1,778 Views

Same system, same wireless adapter, and I'm getting the same results, except in my case the high DPC latency is happening every 10 seconds, not every 10 micro-seconds.

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idata
Employee
1,778 Views

Yes, the yellow bars appear every 10 seconds (not micro-seconds) and they still with latest drivers for Windows 7 64-bit (13.0.0.107).

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idata
Employee
1,778 Views

Hello! I have the exact same problem here. Windows 7, 4965AGN wireless. 10 seconds like clockwork. Anybody heard anything on getting a fix for this?

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idata
Employee
1,778 Views

I'm using Win7 RTM x64, same exact device and driver version (4965AGN, 13.0.0.107 dated 9/15/2009), and I'm having the exact same issue. DPC Latency Checker from http://www.thesycon.de www.thesycon.de shows a >1000us spike every 10 seconds, like clockwork, if I have this device enabled in Device Manager. This is causing clicks and pops in audio recorded via my Alesis USB mixer.

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idata
Employee
1,778 Views

Hi,

I spent many hours troubleshooting a dropped connection issue with the 4965AGN and Win 7.

It appears as though rolling back the driver to 11.1.0.86 has solved the issue for me. I'm running 32-bit but just thought I'd let you know that this driver is working well for me - YMMV.

Ski

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idata
Employee
1,778 Views

I too was having issues on Win7 x64 with drivers, I also went back as far as the 11.1.0.86, manualy installing from the .inf. So far so good.

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idata
Employee
1,778 Views

This worked for me for about 2 days now it seems the issue has returned

Ski

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idata
Employee
1,778 Views

Did you ever resolve this? I have the exact same problem with the 5300 AGN. Every 10 second (exactly) there is a spike of > 1000us, which sometimes causes audio glitches. I am running Windows 7 Professional x64. Disabling the Wireless adapter makes the issue disappear, but that is not really a feasible solution for a laptop.

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idata
Employee
1,778 Views

No it isn't solved, so be patient as Intel doesn't seem to fix this kind of bugs (as NVIDIA stills with over 16000 micro-seconds DPC latencies when powermizer is enabled or just when the driver changes the frequencies between GPU bios defined ones making imposible to do audio/video editing/recording unless you use PowerMizer Switch). The eldery bugs never die Xd (and this is lasting so much)

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idata
Employee
1,778 Views

I have noticed that sometimes when I reboot, there is no DPC latency, but most of the time there is. Only a reboot will make the difference, just disabling/reenabling the card doesn't work. Maybe the issue is related to some resource allocation.

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idata
Employee
1,778 Views

I'm also having this issue and it's clearly from the 4965 driver.

OS: Windows 7 x64 Professional Retail

Driver: 13.0.0.107

Laptop: Lenovo T61p

Problem - High DPC latency every 10 seconds causing intermittent audio skipping in playback and recording

Proof - When I disable my Intel(R) Wireless WiFi Link 4965AGN device - the latency floats around 250us and there is no longer any skipping. This also means I have no internet connection... So that's not a valid workaround. Enabled and it goes right back to the 10 second spikes.

idata
Employee
1,778 Views

Hey, folks. I'm going to see if I can move this question over to the wireless support forum, if that's ok, in the hopes that you will get more insight into the issue you noted. The wireless forum is at /community/tech/wireless http://communities.intel.com/community/tech/wireless .

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idata
Employee
1,778 Views

As there been any news regarding this problem? I am a new Windows 7 user and its starting to get very annoying to listen to music!

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idata
Employee
1,778 Views

This happens for me as well. Win 7 x64 4965AG driver: 13.1.1.1. I can't listen to music on this machine because of my wireless card. Anything I try to play stutters like crazy. http://imgur.com/D0V6q.png http://imgur.com/D0V6q.png

idata
Employee
1,778 Views

With a little more load, the DPC latency gets ridiculous.

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idata
Employee
1,778 Views

It's important to checkout if you have NVIDIA 8XXXM series as they are known to cause over 16.000 micro-seconds DPC latencies when the performance profile is changed (I.E. High performance 3D application is opened). I have reported the bug to NVIDIA over 10 times with no success so as the still with this bug it is better to disable Powermizer with Powermizer Switch or NVGPUPro. Hope this helps to someone as 4965 AGN and NVIDIA 8XXXM are release year coincident and many laptops should include both hadware products.

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idata
Employee
1,778 Views

An interesting idea, but I've got an Ati radeon mobility

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idata
Employee
1,778 Views

I have the same problem on Windows 7 x64 with my 4965AG (N disabled). The card is working in a Lenovo Thinkpad T61 with driver 13.1.1.1 and I already updated everything possible: BIOS, device drivers, Windows updates. Nothing helped.

Every 10 seconds I get DPC spikes of around 1000 µs (after each reboot the heights of the spikes vary a bit):

http://imgur.com/4AbL5.jpg http://imgur.com/4AbL5.jpg

After deactivation of the 4965AG device in the device manager the DPC spikes disappear:

http://imgur.com/RlItq.jpg http://imgur.com/RlItq.jpg

Please fix this Intel! I produce music on this laptop and I do not want to disable WLAN every time I do so. I already had this DPC problem with the 82566MM Gigabit device last year on Windows Vista x64 which was fortunately solved by some driver update.

Regards,

Alex F.

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idata
Employee
1,553 Views

Hey Alex, I have massive DPC latency on my 82566MM as well as my 4965. I know there doesn't seem to be a fix for the 4965, but what driver did you update to to fix your ethernet connection?

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