On 2018-08-26 07:35:14 (-0700), Minie wrote: > Hi, > > I am a user of Archlinux ARM with Raspberry pi3. When starting JACK, the > following error appears. > > Failed to connect to session bus for device reservation: Unable to > autolaunch a dbus-daemon without a $DISPLAY for X11. > To bypass device reservation via session bus, set > JACK_NO_AUDIO_RESERVATION=1 prior to starting jackd. > > I attempted to append JACK_NO_AUDIO_RESERVATION=1 to jackdrc, but jackdrc is > missing anywhere. Please tell me how to avoid errors. Please make sure, that your dbus user service actually started (as it should be enabled by default!). `systemctl --user status dbus` should show something like "Loaded: loaded (/usr/lib/systemd/user/dbus.service; static; vendor preset: enabled)", unless Arch Linux ARM decided to disable this by default now. Also: How do you start jack? If you're adventurous, you can start the daemon with a systemd user service: Create a local directory to hold the service file: `mkdir -p ~/.config/systemd/user/` Copy something like the following (please apply JACK parameters that actually work for your device!): ``` [Unit] Description=JACK After=sound.target local-fs.target [Service] ExecStart=/usr/bin/jackd -P80 -p 512 -d alsa -d hw:PCH,0 -n 2 -p 256 -r 44100 [Install] WantedBy=default.target ``` to ~/.config/systemd/user/jack.service After a `systemctl --user daemon-reload` you can use `systemctl --user start jack` to start this service. You can then also use `systemctl --user enable jack` in case you want to enable it to be run, as soon as the user session starts - if you enable linger for your user, that will be started automaticaly during boot: `loginctl enable-linger` as your user. Best, David -- https://sleepmap.de
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