Comment 77 for bug 996906

Also, after I do:
echo 1 > /proc/asound/card0/pcm0p/xrun_debug

1 is not enough

http://www.alsa-project.org/main/index.php/XRUN_Debug

you need 11 to find out whether hardware pointer are correct on period update and how often lost interrupt occur compared with period update ?

# Enable basic debugging and dump stack, check hardware pointer on the period update
 # Usefull to just see, if PCM stream is stopped for a reason (usually wrong audio process timing from scheduler)
 # And to check the values from driver
 echo 11 > /proc/asound/card0/pcm0p/xrun_debu