T400 audio is sometimes distorted/grainy...

My T400 is pretty good, except that every so often, the sound goes suddenly distorted, or sounds as if there were a loose wire in the chain... the sound just BREAKS up and starts being unstable.
This will go away sometimes when I reboot.
This will go away sometimes when I mere move the computer from place to place.
The movement thing makes me thing it IS a loose connection somewhere, or perhaps a bad sound chip.
Has ANYONE experienced this before?  If I were to tell Lenovo about this, what do you think they would do with it (it's still under warranty)?
- Tim
Message Edited by tbessie on 11-25-2008 11:22 AM

Tim, I guess I'm going to join you on your thread, as your problem seems to be closest to what I'm experiencing. The other threads I've been on (i.e. http://forums.lenovo.com/lnv/board/message?board.id=T_Series_Thinkpads&thread.id=16642) seem to be describing a more serious and continuous problem, as opposed to something that comes and goes.
My problem (as you read in the linked thread) only occurs from time to time and fairly randomly. Its a skip/skipping in audio streams. I wouldn't describe it as grainy, just an interruption or stuttering in the audio. I can only be assured it will occur at or near startup (often the Windows startup sound breaks up), while opening and closing the lid or if the LCD turns off with power settings, and (oddly enough) while playing Windows solitare. It tends to occur more while graphics-intensive things are going on, but not always. I have tried updating and rolling back drivers, and performed a factory reinstall of Windows without luck.
BTW Tim, did you try running the DPC latency program I spoke of in the linked tread? I'd be interested to see if your system looks similar to mine in that respect (it doesn't require any kind of install, its just an executable).
Here's my system idle (with no audio skips), and after closing and reopening the lid (first red bar while closing, other two while opening), respectively:
The idle latencies are sad by themselves as my 5-year-old desktop looks like this:
Also, what's your system's model number? I'm curious how similar our hardware is.
Message Edited by buhaw12 on 12-15-2008 09:30 PM
Kevin
T61 7664-1JU (except with 4 GB of ram)

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