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[Ross Gammon <ubuntu@xxxxxxxxxxxxxxx>]

Hi Len,

It took a long time to work out the best test method.
But I can confirm that the version in the autobuilder fixes the autojack crash once you go into us-controls and save the configuration.

If you upgrade from the old version to the new version with DEV=default still in .config/autojackrc, then run autojack you still get the crash:
$ autojack -h
jackd: no process found
a2jmidid: no process found
Failed to unload module: Module module-jackdbus-detect not loaded
Failed to unload module: Module module-udev-detect not loaded
Failed to unload module: Module module-alsa-card not loaded
--- driver select "alsa"
--- driver param set "capture" -> "none"
--- driver param set "playback" -> "none"
--- driver param set "device" -> "hw:iO2,0,0"
--- driver param set "rate" -> "48000"
--- driver param set "period" -> "1024"
--- driver param set "nperiods" -> "2"
--- start
49
50
Traceback (most recent call last):
  File "/usr/bin/autojack", line 624, in <module>
    main()
  File "/usr/bin/autojack", line 601, in main
    config_start()
  File "/usr/bin/autojack", line 367, in config_start
    start_slave(dev)
  File "/usr/bin/autojack", line 536, in start_slave
    dname, dev, sub = ldev.split(",", 2)
ValueError: not enough values to unpack (expected 3, got 1)

By saving a new config in us-controls with default > DEV=0,0,0
--------------------------------------------------------------

Everything is fine:
$ autojack -h
jackd: no process found
a2jmidid: no process found
Failed to unload module: Module module-jackdbus-detect not loaded
Failed to unload module: Module module-udev-detect not loaded
Failed to unload module: Module module-alsa-card not loaded
--- driver select "alsa"
--- driver param set "capture" -> "none"
--- driver param set "playback" -> "none"
--- driver param set "device" -> "hw:iO2,0,0"
--- driver param set "rate" -> "48000"
--- driver param set "period" -> "1024"
--- driver param set "nperiods" -> "2"
--- start
52
53
Extra internal: 
JACK MIDI <-> ALSA sequencer MIDI bridge, version 8 (7383d268c4bfe85df9f10df6351677659211d1ca) built on Thu Jan  1 01:00:00 1970
Copyright 2006,2007 Dmitry S. Baikov
Copyright 2007,2008,2009,2011,2012 Nedko Arnaudov

Bridge starting...
Using JACK server 'default'
Hardware ports will be exported.
Bridge started
Press ctrl-c to stop the bridge
port created: Midi Through [14] (capture): Midi Through Port-0
port created: Midi Through [14] (playback): Midi Through Port-0
port created: iO 2 [24] (capture): iO 2 MIDI 1
port created: iO 2 [24] (playback): iO 2 MIDI 1

Manually edit file back to DEV=default (naughty!)
-------------------------------------------------

$ autojack -h
jackd: no process found
a2jmidid: no process found
Failed to unload module: Module module-jackdbus-detect not loaded
Failed to unload module: Module module-udev-detect not loaded
Failed to unload module: Module module-alsa-card not loaded
--- driver select "alsa"
--- driver param set "capture" -> "none"
--- driver param set "playback" -> "none"
--- driver param set "device" -> "hw:iO2,0,0"
--- driver param set "rate" -> "48000"
--- driver param set "period" -> "1024"
--- driver param set "nperiods" -> "2"
--- start
55
56
Traceback (most recent call last):
  File "/usr/bin/autojack", line 624, in <module>
    main()
  File "/usr/bin/autojack", line 601, in main
    config_start()
  File "/usr/bin/autojack", line 367, in config_start
    start_slave(dev)
  File "/usr/bin/autojack", line 536, in start_slave
    dname, dev, sub = ldev.split(",", 2)
ValueError: not enough values to unpack (expected 3, got 1)

So us-controls now saves a better default value for new installations,
but someone that was already getting the crash will still get it until
they save a new configuration, and a person that manually edits the
config file will also still get a crash.

Trapping the crash in autojack and printing a suitable error message
would be the perfect fix.

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https://bugs.launchpad.net/bugs/1822463

Title:
  autojack crashed with ValueError in start_slave(): not enough values
  to unpack (expected 3, got 1)

Status in ubuntustudio-controls:
  Fix Committed
Status in ubuntustudio-controls package in Ubuntu:
  Fix Committed

Bug description:
  On a restart, got this crash.

  From memory, I had tried running Hexter without Jack, then started
  Jack with us-controls (auto-ticking the restart option), quit, then
  opened Qjackctl, before quitting and rebooting.

  ProblemType: Crash
  DistroRelease: Ubuntu 19.04
  Package: ubuntustudio-controls 1.7
  ProcVersionSignature: Ubuntu 5.0.0-8.9-lowlatency 5.0.1
  Uname: Linux 5.0.0-8-lowlatency x86_64
  ApportVersion: 2.20.10-0ubuntu23
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sun Mar 31 12:36:11 2019
  ExecutablePath: /usr/bin/autojack
  InstallationDate: Installed on 2019-03-27 (4 days ago)
  InstallationMedia: Ubuntu-Studio 19.04 "Disco Dingo" - Alpha amd64 (20190326.1)
  InterpreterPath: /usr/bin/python3.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 -u /usr/bin/autojack >~/.log/autojack.log 2>&1 < /dev/null &
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Python3Details: /usr/bin/python3.7, Python 3.7.3, python3-minimal, 3.7.2-1
  PythonArgs: ['/usr/bin/autojack', '>~/.log/autojack.log', '2>&1', '<', '/dev/null', '&']
  PythonDetails: /usr/bin/python2.7, Python 2.7.16, python-minimal, 2.7.16-1
  SourcePackage: ubuntustudio-controls
  Title: autojack crashed with ValueError in start_slave(): not enough values to unpack (expected 3, got 1)
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo

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