On Sat, 6 Jul 2013, James Stone wrote: > The output when I try to start jack with 128 frames/period is: > > /usr/bin/jackd -dalsa -r44100 -p128 -n2 -D -Chw:USB,0 -Phw:USB,0 -I512 -O512 -S > jackdmp 1.9.9.5 > Copyright 2001-2005 Paul Davis and others. > Copyright 2004-2012 Grame. > jackdmp comes with ABSOLUTELY NO WARRANTY > This is free software, and you are welcome to redistribute it > under certain conditions; see the file COPYING for details > no message buffer overruns > no message buffer overruns > no message buffer overruns > JACK server starting in realtime mode with priority 10 > audio_reservation_init > Acquire audio card Audio0 > creating alsa driver ... hw:USB,0|hw:USB,0|128|2|44100|0|0|nomon|swmeter|-|16bit > Using ALSA driver USB-Audio running on card 0 - Focusrite Scarlett 2i4 > USB at usb-0000:00:12.2-3, high speed > configuring for 44100Hz, period = 128 frames (2.9 ms), buffer = 2 periods > ALSA: final selected sample format for capture: 32bit integer little-endian > ALSA: use 2 periods for capture > ALSA: final selected sample format for playback: 32bit integer little-endian > ALSA: use 2 periods for playback > ^CJack main caught signal 2 > > ..the device is unusable with the lights flashing on and off. Jack > then shuts down as seen above. > > At 256 frames/period it starts OK. What happens if you run JACK with input only, no audio out? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
