[LAU] Solution for jackd2 and dbus without X session

Apologies for not appending this to the original thread correctly - I just joined the list. This is in reference to this thread about jackd2 and X11/dbus: http://linuxaudio.org/mailarchive/lau/2012/9/16/192998 I had essentially the the same problem as Len when I tried to run jackd: Failed to connect to session bus for device reservation Unable to autolaunch a dbus-daemon without a $DISPLAY for X11 This was in Archlinux on a Raspberry Pi, but I had identical problems under Debian Wheezy on the Raspberry Pi and a "normal" piece of hardware. I tried setting DISPLAY=:0 but it still didn't solve it. Incredibly frustrating. I finally read the man page for dbus-launch and noted that apps which it started expected to have DBUS_SESSION_BUS_ADDRESS set correctly in their session, which it happily provided for them. I also noticed I already had a dbus-daemon running in the base distro. The solution was to set the session bus address variable to the path to that dbus-daemon's socket, like so: export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket When I did that and tried running jackd again, I got a very specific permission error that I was able to resolve by granting my user access to the audio hardware. I added these lines to the other policy settings in /etc/dbus-1/system.conf : <policy user="root"> <allow own="org.freedesktop.ReserveDevice1.Audio0"/> </policy> I restarted my system-level dbus-daemon, and jackd started right up. It shouldn't be too tough now to script that so it's always running when the device starts. I have no idea if that will work for you but perhaps it will put you on the right path. --Mark