Well.. I tried now the version of Jack on kxstudio testing ppa and the problem is the same... :(

This ppa was install jack2, jackd and jackdfirewire packages on version 1.9.9 but the package libjack-jack2.0 is mantained on version 1.9.8

The next step will be to compile jack packages on version 1.9.9

Ivica, or anyone, you have some information how can I compile that? For that I need some help.

Regards

2012/11/23 Ivica Ico Bukvic <ico@vt.edu>

See below (from the linux-audio-user list):

Re: [LAU] question about jackdmp's ability to detect its soundcard has disconnected

Could this be the difference between 1.9.8 and git version?

On Oct 29, 2012 12:10 PM, "Robin Gareus" <robin@gareus.org> wrote:
On 10/29/2012 03:55 PM, Ivica Ico Bukvic wrote:
> All,
>
> I noticed since upgrading to Ubuntu 12.04 that the default Jack server is
> jackdmp (v.1.9.8). Please correct me if I am wrong but my understanding this
> is the smp-enabled version 2 that is being developed in parallel with 1.x
> series of regular jack.

correct. They are also API and ABI compatible.

> Either way, one of my concerns is that while in the old jack when one
> accidentally pulled the soundcard jack was trying to talk to (e.g. a USB
> soundcard), the jack would gracefully stop.

In my experience it stopped but never gracefully (ie it crashed). but
it's been a while since I used jack1.

> The new version (and this could
> be Ubuntu quirk) instead of stopping is pegged in some kind of a spinlock
> that often times locks up the machine (this may be in part since I am
> running a lowlatency kernel with audio group given priority) and at times
> keeps it operational while hogging the cpu and making the computer barely
> responsive until jackd is killed. Apps connected to jack that I tested so
> far are also stuck in a loop waiting for a response from jack (although this
> could be the app's shortcoming)--jack never broadcasts a signal that it has
> lost the soundcard (AFAICT). FWIW I am running jackdmp through qjackctl...
> Any thoughts on this matter would be most appreciated.
>

I can't reproduce this. jack2 stops the backend when the device is
disconnected. You can switch to a new backend using jack_control
(sending some Dbus messages to jackd) without re-starting jackd. No CPU
hogging here. - I'm running jack2 - aka 1.9.9.4 from git.

robin

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