Thinkpads Forum

Hi there!

I own an T420s in maximum outfit ...Core i7-2640M and Nvidia Quadro NVS 4200M (Optimus)

which has now even an FHD panel....

and i have anoying sound problems with that machine...

My OS is Windows 7 Professional, my Internet Security is GData....my main drive is a Crucial MX100 with 256GB and new firmware...i have two bars of 8GB Crucial Ram...

The thing is...everytime when i am playing music there is from time to time an crack in the sound...and this is making me kind of weird...

I have read many threads in the german forum....for some it is a latency problem, for others it is an driver problem, nvidia or ethernet....wlan….

I have downgraded the ethernet driver, i have taken the the driver for the soundcard from the conexant website,...i have chosen the chipset drivers from the intel site...because the actual lenovo drivers haven't brought an solution to my problem, but nothing...

The sound is cracking....mostly internet stream but also when i listen to music on the drive...or an usb drive...

Checked the T420s out with an Linux on an HDD...no problems at all.....

So does anyone can help in this?

ThankS!!

Kind regards,

PAnDoRa

That is a very nice T420s setup you have. Good SSD drive, nice processor and plenty of ram. My keep it simple stupid approach is to do a clean install of Windows 7. I think that will solve your problem.

Hi!

Thanks for your answer.....but let's see....if anyone else has another solution for this special problem i have...

Kindly,

PAnDoRA

Have you tried DPC Latency Checker http://www.thesycon.de/deu/latency_check.shtml or a similar tool?
Maybe it can help you identify the cause of the issue.

I have often run LatencyMon rather than dpc latency checker, as it seems to give more clues.

http://www.resplendence.com/downloads

Thanks all!

But i have sold the machine...and now i'm looking for a huge workstation such as W520....with Nvidia 2000m and FHD...

This problems with the sound were too much trial an error for me...have no time at all to do much more trial an error...

Kindly,

PandoRA

Well that's one way to "solve" the issue. Leave it for the next guy to figure out.