[LAU] jack no longer starting with Audiophile 2496 on desktop PC

It was working. Now it's not. JACK starts up fine with the built-in audio @ 96K and ~2.33msec latency. Doesn't work with 2496 @ 96K (or 48K) at much higher latencies. Using kernel 3.2.0-4 AMD64 Debian Sid via Aptosid, with and without RT; also tried kernel 3.13 (non-RT). I am a member of the audio group. alsa-base shows v1.0.25+3, things like alsa-tools-gui report 1.0.27-2, alsa-utils 1.027.2-1. Starting from command line gives me this: david@sempronbox:~$ /usr/bin/jackd -dalsa -dhw:M2496 -r96000 -p512 -n2 -Xseq jackdmp 1.9.10 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2013 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 Audio3 creating alsa driver ... hw:M2496|hw:M2496|512|2|96000|0|0|nomon|swmeter|-|32bit configuring for 96000Hz, period = 512 frames (5.3 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 port created: Midi-Through:midi/playback_1 port created: Midi-Through:midi/capture_1 port created: E-MU-XMidi1X1:midi/playback_1 port created: E-MU-XMidi1X1:midi/capture_1 port created: M-Audio-Audiophile-24/96:midi/playback_1 port created: M-Audio-Audiophile-24/96:midi/capture_1 ALSA: poll time out, polled for 15999020 usecs JackAudioDriver::ProcessAsync: read error, stopping... ^CJack main caught signal 2 port deleted: E-MU-XMidi1X1:midi/playback_1 port deleted: M-Audio-Audiophile-24/96:midi/playback_1 port deleted: Midi-Through:midi/playback_1 port deleted: E-MU-XMidi1X1:midi/capture_1 port deleted: M-Audio-Audiophile-24/96:midi/capture_1 port deleted: Midi-Through:midi/capture_1 Released audio card Audio3 audio_reservation_finish Was doing it in previous 3.2 non RT kernel, updated to 3.13 kernel and still doing it. QJackCtl reports this: 21:24:33.243 Patchbay deactivated. 21:24:33.254 Statistics reset. 21:24:33.255 ALSA connection change. Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started 21:24:39.134 Startup script... 21:24:39.135 artsshell -q terminate Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started sh: 1: artsshell: not found 21:24:39.537 Startup script terminated with exit status=32512. 21:24:39.537 JACK is starting... 21:24:39.537 /usr/bin/jackd -dalsa -dhw:M2496 -r96000 -p512 -n2 -Xseq 21:24:39.539 JACK was started with PID=4684. no message buffer overruns no message buffer overruns no message buffer overruns jackdmp 1.9.10 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2013 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 JACK server starting in realtime mode with priority 10 audio_reservation_init Acquire audio card Audio3 creating alsa driver ... hw:M2496|hw:M2496|512|2|96000|0|0|nomon|swmeter|-|32bit configuring for 96000Hz, period = 512 frames (5.3 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 port created: Midi-Through:midi/playback_1 port created: Midi-Through:midi/capture_1 port created: E-MU-XMidi1X1:midi/playback_1 port created: E-MU-XMidi1X1:midi/capture_1 port created: M-Audio-Audiophile-24/96:midi/playback_1 21:24:39.733 ALSA connection graph change. port created: M-Audio-Audiophile-24/96:midi/capture_1 21:24:46.671 Could not connect to JACK server as client. - Overall operation failed. - Server communication error. Please check the messages window for more info. JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out Driver is not running Cannot create new client Cannot read socket fd = 16 err = Success CheckRes error JackSocketClientChannel read fail Cannot open qjackctl client 21:24:48.496 JACK is stopping... Jack main caught signal 15 ALSA: poll time out, polled for 15999021 usecs JackAudioDriver::ProcessAsync: read error, stopping... port deleted: E-MU-XMidi1X1:midi/playback_1 port deleted: M-Audio-Audiophile-24/96:midi/playback_1 port deleted: Midi-Through:midi/playback_1 port deleted: E-MU-XMidi1X1:midi/capture_1 port deleted: M-Audio-Audiophile-24/96:midi/capture_1 port deleted: Midi-Through:midi/capture_1 21:24:55.791 ALSA connection graph change. Released audio card Audio3 audio_reservation_finish 21:24:55.923 JACK was stopped successfully. 21:24:55.928 Post-shutdown script... 21:24:55.929 killall jackd jackd: no process found 21:24:56.335 Post-shutdown script terminated with exit status=256. aplay -l shows this: **** List of PLAYBACK Hardware Devices **** card 0: SB [HDA ATI SB], device 0: VT1828S Analog [VT1828S Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: SB [HDA ATI SB], device 1: VT1828S Digital [VT1828S Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: SB [HDA ATI SB], device 2: VT1828S Alt Analog [VT1828S Alt Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 3: M2496 [M Audio Audiophile 24/96], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 Figuring that maybe it was a piece of dead hardware, I booted a stock Ubuntu 13.04 AMD64 live DVD, added JACK and some other pertinent stuff, set it up with the same settings I use in the installed Aptosid setup - and the damn thing worked. Linux audio is very fragile, apparently. Ideas? -- David W. Jones gnome(a)hawaii.rr.com authenticity, honesty, community http://dancingtreefrog.com