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Punch Card
Posts: 12
Registered: ‎03-14-2012
Location: Canada
Message 1 of 15 (768 Views)

T520 Audio Crackling

Had the laptop for about a month now. Ran all necessary updates and still having a problem with audio playback constantly 'crackling'. Any sort of audio playback will do it, just annoying crackles in the background which make listening to anything impossible.

Enormous red spikes constantly on the DCP latency checker.

Windows 7 64bit

T520 Model 4239, Intel Core i5-2540M CPU @ 2.60GHz, 8GB RAM
Nvidia NVS 4200M Graphics, Intel Advanced-N 6205 Wireless adapter
Windows 7 Pro - x64
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Guru
Posts: 9,240
Registered: ‎12-26-2009
Location: Toronto, Canada
Message 2 of 15 (761 Views)

Re: T520 Audio Crackling

Try LatencyMon instead; it will list the precise drivers that are causing the issue.

Also try uninstalling the Intel Management stuff if you don't need it. The AMT driver adds a bit to latencies in my experience.
W520: 2720QM, Q2000M at 1082/1376, 32GB RAM, 500GB + 750GB HDD, FHD screen & MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 160GB HDD, WXGA+ screen
TPT1: 1839-23U
What's DOS?
Posts: 1
Registered: ‎07-29-2012
Location: United States
Message 3 of 15 (661 Views)

Re: T520 Audio Crackling

Work office just bought 12 t520's. Thought it was just my own device having the crackling sound. Went back to work and tried multiple machines and sure enough it's happening on all of them. This problem is on top of the already dismal max volume which barely fills a room.
SCSI Port
Posts: 45
Registered: ‎03-10-2010
Location: Cincinnati OH
Message 4 of 15 (657 Views)

Re: T520 Audio Crackling

I would keep this thread open for awhile. Most latency problems are solved with a BIOS update, I think. Lenovo gave us one to solve latency spikes on the ThinkStation S20.
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ThinkPad T60p Core 2 Duo, 2GB RAM, 1x100GB HDD
ThinkStation S20 Xeon-W3670, 12GB RAM, 1x500GB HDD, 1x1TB HDD
Former Employee
Posts: 2,835
Registered: ‎03-20-2012
Location: Malaysia
Message 5 of 15 (621 Views)

Re: T520 Audio Crackling

hi all,

 

Was reading through this thread and wanted to check was there anything in particular that you had installed Prior to it happening? Its really hard to pin point what the cause as many factors come to my mind. Harware could be one of them but before i conclude it is hard ware would like to eliminate the possibilities of software first. 

In the past there were something similar to this issues where by uninstalling the Mcafee Antivirus Did the trick. I woulod suggest trying to uninstall the Mcafee First and check for the changes (Only applies to thise that have Mcafee Preinstalled on the machine).

 

Do let me know of the changes.

 

Regards

Former Employee
Posts: 2,835
Registered: ‎03-20-2012
Location: Malaysia
Message 6 of 15 (577 Views)

Re: T520 Audio Crackling

hi all,

 

Just wanted to check with you if you had tried my suggestion earlier? Do let me know of the changes.

 

Regards

Punch Card
Posts: 12
Registered: ‎03-14-2012
Location: Canada
Message 7 of 15 (557 Views)

Re: T520 Audio Crackling

Thanks for keeping this open. I don`t believe this started after any installs, but I don`t exactly recall when I started noticing it.

I've ran latency checker for a bit, which pointed to iaStor.sys (Intel Rapid Storage Driver). I tried installing different releases of these drivers, or finding an alternative but no luck.

I called Lenovo support and a technician remoted into my PC and checked that all drivers were up to date, but there was still no solution.

I found a thread which mentioned disabling the nVidia NVS 4200M, so I did this and the latency problem stopped. This of course is a temporary fix, and I would like to get to the bottom of it (however, it`s worth mentioning to anyone with this issue).

I use Symantec Endpoint Protection, as well as MBAM, but I don`t think they`re the culprit.

 

T520 Model 4239, Intel Core i5-2540M CPU @ 2.60GHz, 8GB RAM
Nvidia NVS 4200M Graphics, Intel Advanced-N 6205 Wireless adapter
Windows 7 Pro - x64
Bit Torrent
Posts: 2,031
Registered: ‎03-08-2012
Location: Belleville, Ontario Canada
Message 8 of 15 (540 Views)

Re: T520 Audio Crackling

Is the Nvidia active GPU when this is happening? There is an Nvidia sound driver part of the Nvidia Optimus package. But if control panel show you're running the Intel GPU it should not be related. Just a though. I have now problem here but I an not using the Lenovo drivers since the caused many problems when I got the system I went to another driver set from Nvidia
T520 Model 4239 Intel(R) Core(TM) i7-2860QMbr>; Nvidia NVS 4200M Windows 7 Home Prem - 64bit w/8GB
Z70-80 I7 - 5500U 16GB GB - 1TB HD Window 8.1 64bit FHD 17.3 inch Display, Nvidia G840 w/2GB memory

Punch Card
Posts: 12
Registered: ‎03-14-2012
Location: Canada
Message 9 of 15 (466 Views)

Re: T520 Audio Crackling

No, NVIDIA GPU isn't running at the time. The NVIDIA only kicks in during high intense graphics (games mostly). 

Here are some screenshots of LatencyMon with and without the NVIDIA driver enabled.

http://i.imgur.com/p9HWd.png (Enabled)

http://i.imgur.com/AXaWx.png (Disabled)

 

T520 Model 4239, Intel Core i5-2540M CPU @ 2.60GHz, 8GB RAM
Nvidia NVS 4200M Graphics, Intel Advanced-N 6205 Wireless adapter
Windows 7 Pro - x64
Bit Torrent
Posts: 2,031
Registered: ‎03-08-2012
Location: Belleville, Ontario Canada
Message 10 of 15 (458 Views)

Re: T520 Audio Crackling

I went back and don't see  the spec's on your machine!

No CPU, memory etc which is a basis for analysis.

 

Clearly you have the right audio drivers and if it doing it with music playback from say Itunes or a music CD. I would have to say it must be a hardware problem in which you'd have to take it in for service.

T520 Model 4239 Intel(R) Core(TM) i7-2860QMbr>; Nvidia NVS 4200M Windows 7 Home Prem - 64bit w/8GB
Z70-80 I7 - 5500U 16GB GB - 1TB HD Window 8.1 64bit FHD 17.3 inch Display, Nvidia G840 w/2GB memory

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