27 Aug
2018
27 Aug
'18
1:03 a.m.
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