Linux Mint: Jack cannot start (it did work, then failed, now broken)

[hanzf]

Hello,

I recently changed from Puppy Linux to Linux Mint 17.3.
I installed Ardour 4.6, and I also installed invada-studio-plugins-lv2 and caps-lv2 plugins.
The first time I ran it, ardour worked, but then, suddenly, the sound was completely gone, not only in Ardour but all over the system.
I got the sound back running

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sudo alsa force-reload

and rebooting the computer.
Now every time I start Ardour and try to load a session, I get the error message "cannot reconnect to audio/MIDI engine".
Then the sound is gone again, and I get it back by running "sudo alsa force-reload". No reboot necessary.
When I start jackqctl, I see the following in the message window:

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23:22:57.471 Patchbay deactivated.
23:22:57.501 Statistics reset.
23:22:57.597 ALSA connection change.
23:22:58.465 D-BUS: Service is available (org.jackaudio.service aka jackdbus).
Cannot connect to server socket err = Connection refused
Cannot connect to server request channel
jack server is not running or cannot be started
23:22:58.494 ALSA connection graph change.

Then I click "start" in jackqctl, and this is what jack says:

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23:42:27.330 D-BUS: JACK server could not be started. Sorry
Thu Jul  7 23:42:02 2016: Starting jack server...
Thu Jul  7 23:42:02 2016: JACK server starting in realtime mode with priority 7
Thu Jul  7 23:42:02 2016: Acquired audio card Audio0
Thu Jul  7 23:42:02 2016: creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit
Thu Jul  7 23:42:02 2016: configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 2 periods
Thu Jul  7 23:42:02 2016: ALSA: final selected sample format for capture: 32bit integer little-endian
Thu Jul  7 23:42:02 2016: ALSA: use 2 periods for capture
Thu Jul  7 23:42:02 2016: ALSA: final selected sample format for playback: 32bit integer little-endian
Thu Jul  7 23:42:02 2016: ALSA: use 2 periods for playback
Thu Jul  7 23:42:07 2016: ERROR: JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Thu Jul  7 23:42:07 2016: ERROR: Driver is not running
Thu Jul  7 23:42:07 2016: ERROR: Cannot open client name = dbusapi
Thu Jul  7 23:42:07 2016: ERROR: failed to create dbusapi jack client
Thu Jul  7 23:42:07 2016: ERROR: CheckSize error size = 32 Size() = 12
Thu Jul  7 23:42:07 2016: ERROR: CheckRead error
Thu Jul  7 23:42:07 2016: ERROR: CheckSize error size = -1 Size() = 4
Thu Jul  7 23:42:07 2016: ERROR: CheckRead error
Thu Jul  7 23:42:07 2016: ERROR: CheckSize error size = 0 Size() = 12
Thu Jul  7 23:42:07 2016: ERROR: CheckRead error
Cannot connect to server socket err = Connection refused
Cannot connect to server request channel
jack server is not running or cannot be started
23:42:52.696 Could not connect to JACK server as client. - Overall operation failed. - Server communication error. Please check the messages window for more info.
Cannot read socket fd = 21 err = Success
CheckRes error
JackSocketClientChannel read fail
Cannot open qjackctl client
Thu Jul  7 23:42:52 2016: ERROR: JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Thu Jul  7 23:42:52 2016: ERROR: Driver is not running
Thu Jul  7 23:42:52 2016: ERROR: Cannot create new client
Thu Jul  7 23:42:52 2016: ERROR: CheckSize error size = 32 Size() = 12
Thu Jul  7 23:42:52 2016: ERROR: CheckRead error
Thu Jul  7 23:42:52 2016: ERROR: CheckSize error size = -1 Size() = 4
Thu Jul  7 23:42:52 2016: ERROR: CheckRead error
Thu Jul  7 23:42:52 2016: ERROR: CheckSize error size = 0 Size() = 12
Thu Jul  7 23:42:52 2016: ERROR: CheckRead error

I tried pasuspender as described here: viewtopic.php?t=13234 but it didn't help.

Who has an idea what's wrong?
Should I post the JACK settings or other config information?

thank you,

Hans

[hanzf]

something is wrong with the soundcard, it doesn't want to start.
is it a usb one? I'd check the cables...

Can you see this in the data I posted?
The soundcard is onboard. When I start the computer, I can play media with VLC, and watch youtube videos with chromium. Sound is ok, no problem. Only when I try to start JACK, I get the above-mentioned error message, and then I have to run "sudop alsa force-remove" in order to get the sound to work again.
Are you sure its a hardware problem?

[hanzf]

Ok, I ran puppy linux 5.7.1 on my computer, and jack worked with no problems.
Would it make sense to take the jack configuration settings from the puppy linux version to linux mint?