sound/snd_hda regression

-pcm0: <HDA Driver Revision: 20070225_0040>
+pcm0: <HDA Driver Revision: 20070316_0041>

this is the only diff between verbose dmesg, which
is here (newacpi makes no difference):
http://bsd.cenkes.org/abc/dmesg.newacpi.bz2

The new revision produces loud electronic noise,
like very short looping, which makes the sound
card virtually unusable.

Thanks!