Created attachment 81061 [details]
lshw for machine experiencing the problem.
To reproduce (on Ubuntu 12.04 and intel HDA):
Just boot and log in.
Already startup sound can be heard crippled and all other applications playing sound show the same effect.
Problem not experienced in kernel 3.4, but 3.6-rc6 and rc7 have the problem.
Created attachment 81071 [details]
Crippled sound example
Sound effect ogg-example attached.
I have previously filed the bug here:
could be this?
I suffered from the same and patched my kernel by reverting that change. Works fine now...
This bug should have been fixed in upcoming 3.7-rc1 and 3.6.2.
The fix commit is 99df18b31db389ec6abc8ad5415c14e7bb752b58.