cannot start JACK using standard power-of-2 period sizes on Panda

[Dan MacDonald]

I am currently running precise on my Pandaboard (rev A4) and, just as is also the case under Oneiric and Linaro 12.02, I am unable to use qjackctl to start JACK because JACK says it cannot set the period size to any power of 2. My kernel is 3.2.0-1409-omap4 and this is the sort of error I get:

21:11:18.451 Patchbay deactivated.
21:11:18.561 Statistics reset.
21:11:18.601 ALSA connection change.
21:11:18.643 D-BUS: Service is available (org.jackaudio.service aka jackdbus).
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
21:11:18.673 ALSA connection graph change.
21:11:40.053 D-BUS: JACK server could not be started. Sorry
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
Thu Mar 22 21:11:39 2012: Starting jack server...
Thu Mar 22 21:11:39 2012: JACK server starting in realtime mode with priority 10
Thu Mar 22 21:11:39 2012: ERROR: Cannot lock down 82246176 byte memory area (Cannot allocate memory)
Thu Mar 22 21:11:39 2012: control device hw:0
Thu Mar 22 21:11:39 2012: control device hw:0
Thu Mar 22 21:11:39 2012: Acquired audio card Audio0
Thu Mar 22 21:11:39 2012: creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
Thu Mar 22 21:11:39 2012: control device hw:0
Thu Mar 22 21:11:39 2012: ERROR: ALSA: Cannot open PCM device alsa_pcm for capture. Falling back to playback-only mode
Thu Mar 22 21:11:39 2012: configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
Thu Mar 22 21:11:39 2012: ALSA: final selected sample format for playback: 32bit integer little-endian
Thu Mar 22 21:11:39 2012: ERROR: ALSA: cannot set period size to 1024 frames for playback
Thu Mar 22 21:11:39 2012: ERROR: ALSA: cannot configure playback channel
Thu Mar 22 21:11:39 2012: ERROR: Cannot initialize driver
Thu Mar 22 21:11:39 2012: ERROR: JackServer::Open() failed with -1
Thu Mar 22 21:11:40 2012: ERROR: Failed to open server
Thu Mar 22 21:11:40 2012: Saving settings to "/home/dan/.config/jack/conf.xml" ...
21:11:46.834 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started

$ apt-cache policy jackd
jackd:
  Installed: 5
  Candidate: 5
  Version table:
 *** 5 0
        500 http://ports.ubuntu.com/ubuntu-ports/ precise/universe armhf Packages
        100 /var/lib/dpkg/status

$ jackd --version
jackdmp 1.9.8
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2011 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
jackdmp version 1.9.8 tmpdir /dev/shm protocol 8

Sorry if this should've been posted against ALSA or TI OMAP instead - if so then please re-categorize as required - thanks!