Re: running jackd from rc.local

[Athanasios Silis <athanasios.silis@xxxxxxxxx>]

Hi Len,

i am using ubuntu studio.

the pc i refer to is used for audio processing and routing primarily - it is a jack client server.

so without any user intervention apart from powering it ON , it gets audio through ethernet from the jack master, processes it and sends it out through its local soundcards.

on occasions I want to log on and use this computer for local audio capturing and / or playback. so jack would ideally run independent of a user session. Having said that, I usually don't need to log out and back in, I tend to lock the system as I am a single user. no need to deal with multiple user case now.

I use a locally compiled jack2 version without dbus support because I had a version mismatch between windows and linux jack.
some audio applications (namely calf) need an X server so in my custom startup scripts I start a vnc session as well.

The problem as I understand it is that after log on, pam.d elevates logged in user's privileges to access hardware. The main problem is that alsa_(in|out) is can not grab the local soundcards... and I do not know what could be the conflict. people over at jack-devel mailing list said it could bea number of things like pulseaudio or lightdm....

there seems  to be a conflict or ideologies because some one suggests I make a system init script and another says jack is not designed to run as a system service.

Personally, I think that jack is indeed not designed as a system service, but I could be wrong. what is more a jack run as root, would never be available to applications that I would start as a user. is that so?

I think I replied to everything :)

On Sat, Apr 18, 2015 at 6:01 PM, Len Ovens <len@xxxxxxxxxxxxx> wrote:

On Sat, 18 Apr 2015, Athanasios Silis wrote:

Hi Len,
unfortunately the .desktop file is not good for me.
it is only run after I have logged in, whereas I want my script to be started as
me, but before I log in.
Is there a way to achieve that, without resorting to autologin ?

OK, perhaps a full description of what you are trying to acheive would help. little bits of info I think I have put together include:
 - You will be using a DE at some point.
 - You want to be able to access jack after logging in as well as before
 - jack is still to be used only by one user
 - jack2 is prefered?
 - what would jack be doing while logged out I don't know
 - should jack continue to run after logout?
        (that is do you normally logout and in)
 - Is most of the running done by script anyway and loggin in is used mostly for other things besides audio? Can all audio stuff be done by command line?
 - will jack be used as a device for pulseaudio...
 - will pulse run at all? if so will it ever touch the same device as jack has?
 - is your machine using sysv init, systemd, upstart? (upstart is going away BTW, leaving one to wonder about the future of MIR)

As Jeremy has already suggested have you tried:

export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket
jack_control start

in the script run by your su user?

--
Len Ovens
www.ovenwerks.net

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