[ntp:hackers] AC97 audio

David L. Mills mills at udel.edu
Tue Nov 14 07:20:38 PST 2006


Guys,

Further to the behavior I reported about FreeBSD audio and the WWV/H 
driver. About every minute or two the driver would skip 120 ms of codec 
samples. I thought that peculiar to the particular motherboard, but now 
I have further evidence. The glitch occurs on two different Intel 
motherboards with the AC97 mixer chipset. It does not occur with at 
least one other sound card. I can find no explanation for the glitch, 
which causes more or less constant loss of 960 samples of 8000-Hz 
signal. Note the sound cards and mixer work fine with Windows/XP and 
with sound cards other than compliant AC97.

Dave


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