[LAU] X Runs at Exactly 10 Minute Intervals

Hoping someone can help me figure out what's causing X runs at precisely 10 minute intervals - not 9:59, not 10:01 but exactly 10 mins. My setup: AMD 64 X2 2 GB DDR2 800 mhz M-Audio Firewire Solo using Freebob Sample rate: 96,000 Periods: 3 Frames: 64 Latency: 2 ms Realtime checked in Qjackctl Priority = 89 Qjackctl 0.2.21 # ps -C jackd -cmL shows: PID LWP CLS PRI TTY TIME CMD 24142 - - - ? 00:14:40 jackd - 24142 TS 20 - 00:00:00 - - 24143 TS 24 - 00:00:00 - - 24144 TS 24 - 00:00:00 - - 24145 TS 24 - 00:00:00 - - 24146 FF 139 - 00:00:00 - - 24147 FF 129 - 00:05:51 - - 24148 FF 132 - 00:00:00 - - 24149 FF 132 - 00:00:00 - - 29990 FF 139 - 00:00:00 - - 29991 FF 133 - 00:00:25 - As I understand it, the FF indicates realtime. Messages from JACK: Load = 6.0202 max usecs: 44.000, spare = 622.000 LibFreeBoB ERR: SLAVE XMT : Buffer underrun! 64 (0 / 256) (0 / 0 ) 17:34:51.873 XRUN callback (2). FreeBoB MSG: xrun detected LibFreeBoB ERR: Xrun on connection 1 load = 53.0101 max usecs: 3481.000, spare = 0.000 load = 29.7333 max usecs: 43.000, spare = 623.000 Load = 4.9502 max usecs: 25.000, spare = 641.000 LibFreeBoB ERR: MASTER RCV: Buffer overrun! LibFreeBoB ERR: Xrun on connection 1 17:44:51.782 XRUN callback (3). FreeBoB MSG: xrun detected load = 4.4270 max usecs: 26.000, spare = 640.000 Note that in the first instance it's an underrun; 2nd instance an overrun, which seems odd to me (ie I'd think with the X runs happening on such a precise schedule it would show the same problem each time). I've tried using System Manager to track down any processes which might be scheduled to run every 10 mins and can't pin down anything. I also tried stopping ntpd but the problem continued. Other programs which run simultaneously: - Beryl - Mythtv backend Using Ardour neither increases the X runs nor eliminates them - they still pop up at 10 min intervals. Any ideas or suggestions? Could Freebob be the problem? Are there system processes known to run at 10 min intervals that could be interfering? Also, not sure this has anything whatsoever to do with my X runs, but Qjackctl also reports a whole series of: QTextCursor::gotoParagraph Index: 49 out of range load = 4.1724 max usecs: 26.000, spare = 640.000 load = 4.0381 max usecs: 26.000, spare = 640.000 load = 3.9710 max usecs: 26.000, spare = 640.000 QTextCursor::gotoParagraph Index: 49 out of range QTextCursor::gotoParagraph Index: 49 out of range I also tried running JACK from console, with the same results. Driving me nuts as every time I need to do a take, I have to wait until an X run hits, then I have a 10 min window to record, which leaves me thinking about the impending X run, rather than the part I'm playing! Many thanks!