I'm afraid I don't know much more than you do at this point. Theoretically, if the watermark is 60 ms, anything below approx 50 ms shouldn't cause an underrun.
Btw, are the "calibration timeout" and the "underrun" messages synchronized? You should be able to see both if you look in /var/log/syslog.
I'm afraid I don't know much more than you do at this point. Theoretically, if the watermark is 60 ms, anything below approx 50 ms shouldn't cause an underrun.
Btw, are the "calibration timeout" and the "underrun" messages synchronized? You should be able to see both if you look in /var/log/syslog.