Bug#905774: jackd2: jackd no longer starts, since device is already in use; but who's using it?

[Francesco Poli]

On Thu, 9 Aug 2018 13:22:55 +0200 Klaumi Klingsporn wrote:

> Am / On Thu, 09 Aug 2018 12:35:28 +0200
> schrieb / wrote "Francesco Poli (wintermute)"
> <invernomuto at paranoici.org>:
> 
> > Why my jackd does not tell me which application is using
> > hw:0 ?!? How can I figure out which application is
> > getting in the way?
> 
> Maybe because jackd doesn't know about them?

What do you mean? Does jackd only check for a list of applications
known to lock the soundcard resource, and otherwise spit a more vague
error message?!?

> Top maybe the tool of your choice!

Well, top(1) shows all the running processes, in descending order of
resource (CPU, memory, ...) occupation.
Does it have an option or command to show which process is using the
soundcard? I failed to find any...

> 
> > Please help me to investigate
> 
> Only two guesses: pulseaudio may block your device. Try 
> 
> pulseaudio -k
> 
> before starting jackd.

This cannot be the case, since pulseaudio is not installed.

> 
> And than there's debian bug #901931 which gave me the same
> problem last time: timidity-daemon 2.14.0-3 blocked the
> sound-device (even for pulseaudio).

Bingo!
After purging timidity-daemon, everything works again!

I still have to understand why I had timidity-daemon installed on that
box: aptitude logs show that it had been there since long ago (the
oldest log shows an UPGRADE, rather than an INSTALL), but I am sure I
have never installed it manually. Indeed it was marked as automatically
installed, but no other installed package currently depends on or
recommends it.
On another machine with an almost identical list of manually installed
packages, I do not have timidity or timidity-daemon installed...


But anyway, thanks a lot for your really prompt and helpful reply!
I wish I could get this positive experience every time I report a
bug!  ;-)

Bye.

-- 
 http://www.inventati.org/frx/
 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE
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