Comment 83 for bug 996906

seem dump stack is not useful

just need 1+4+8 = 13

 1 Basic debugging - show xruns in ksyslog interface
 2 Dump stack - dump stack for basic debugging
 4 Jiffies check - compare the position with kernel jiffies (a sort of in-kernel monotonic clock),
     show what's changed when basic debugging is enabled
 8 Dump positions on each period update call
 16 Dump positions on each hardware pointer update call
 32 Enable logging of last 10 ring buffer positions
 64 Show the last 10 ring buffer position only once (when first error situation occured)