For the archives, this problem showed up because I disabled the microphone in the BIOS. Thanks to deraadt@ for pointing this out and also pointing me to contact ratchov@ who has been trying to fix this issue. After corresponding with ratchov@ as well with debug info and so forth, the issue has now been fixed in revision 1.230 of sys/dev/pci/azalia.c. I now have the microphone disabled and sound works perfectly. Thank you to deraadt@ and ratchov@ for the quick help and fix.
Bryan
