On 14-10-13 05:04, James Harkins wrote: > Sorry if this is an obvious question, but I'm short of time today and > really tired of Google searching. > > I'm running: > > Linux dlm-A6200 3.2.0-54-lowlatency #56-Ubuntu SMP PREEMPT Thu Sep 19 > 17:22:47 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux > > I have jack 2 connected via ALSA to an M-Audio Fast Track Pro. > > If there is any slight glitch in the USB power -- for instance, in a > performance space where the sound engineer might need to plug/unplug > cables frequently -- jackd spins out of control on one CPU and often > locks up the user interface, forcing a hard shutdown and reboot. If I'm > very lucky, I can get into the terminal, find jack's PID and kill it, > but when the mouse and keyboard stop responding, there's nothing I can > do reach for the power button. > Hello James, This doesn't work either to reboot? http://en.wikipedia.org/wiki/Magic_SysRq_key#Uses > This occurs less frequently in 12.04 than it did when I started with > 10.04, but when it does happen (as it did just now), it really, really > ticks me off. > > I think there must be some automated way for the system to recognize > that jack is out of control and kill it. [1] notes: > > -t, --timeout int > Set client timeout limit in milliseconds. The default > is 500 > msec. In realtime mode the client timeout must be smaller > than > the watchdog timeout (5000 msec). > > Interesting... "watchdog timeout"... but I have never seen any effect > from the watchdog mentioned here. Jack just keeps locking up the system > for way longer than 5 seconds. > Afaik Jack2 doesn't have a watchdog thread. > I'm happy to provide more info if you can tell me what commands to run. > Normally I would research it myself, but I'm just not in the mood today. > If there's already good documentation on this, great, but... too many > pages to read and I have no idea which is the best one. > Maybe you could try with a split USB cable: http://sourceforge.net/apps/mediawiki/guitarix/index.php?title=Guitarix_Embedded_/_ARM_SoC#Fighting_the_Noise Jack2 has D-Bus support so maybe you could do something creative with that. Best, Jeremy > Thanks, > hjh > > [1] http://manpages.ubuntu.com/manpages/precise/man1/jackd.1.html > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user
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