[pulseaudio-discuss] strange pulse / jack behaviour

Patrick Shirkey pshirkey at boosthardware.com
Mon Oct 29 07:12:00 PDT 2012

On Mon, October 29, 2012 9:39 pm, Richard Bown wrote:
> On Mon, 29 Oct 2012 20:59:05 +1100
> Patrick Shirkey <pshirkey at boosthardware.com> wrote:
>> Hi,
>> Does anyone have any thoughts on why the following is happening?
>> Using Debian wheezy on an intel board with built in HDA chipset.
>> (Notebook
>> sound card)
>> I was unable to start jack. It seemed like the problem might have been
>> because pulse was running so I killed pulse with "pulseaudio -k". That
>> didn't help. I installed pulseaudio-module-jack and configured
>> /etc/pulse/default.pa to include
>> load-module module-jack-sink
>> load-module module-jack-source
>> restarted pulseaudio with pulseaudio -k ; pulseaudio and it attempted to
>> start jack server but was not able to. At that point I was unable to get
>> pulseaudio to start at all or jack so I decided to reboot in case it was
>> a
>> kernel oops.
>> After rebooting pulseaudio still would not start. I tried a couple of
>> options but in the end I had to run "pulseaudio --system -D" as
>> superuser.
>> After doing that jackd would run from qjackctl but there are not
>> pulse-sink/source connections in jack probably because pulse is running
>> as
>> superuser but I'm not 100% on the exact reason for this behaviour. I can
>> see that pulseaudio is running with "ps aux".
>> If recent feedback on LAU list anything to go by it seems that I'm not
>> the
>> only one who has encountered issues similar to this recently.
>> --
>> Patrick Shirkey
> Patrick are you using jack to connect the onboard HDA to an app using jack
> and
> then to the jack-source module ?

The jack-source/sink connections don't even appear in qjackctl.

> If so you need to unload the pulse alsa module for the Intel device, so
> that
> the system inputs and outputs appear when using the jack connection in
> qjackctl.

I will look at that tomorrow. I thought from previous experience that
pulse was able to automatically reconfigure itself if the jack modules
were installed. Either way I never had to run pulseaudio as root before to
get the jack sink/source connections to load in jack. Seems like something
has been borked in Debian Wheezy.

> I managed to get to the stage of everything looking good with jack
> connections,
> but didn't get incoming audio to the jack-source module. I suspect that
> problem
> may have been with the app I was using.
> meterbridge is very useful for checking connections with jack connect

jack_lsp works pretty well too ;-)

Patrick Shirkey
Boost Hardware Ltd

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