My PulseAudio server, connected to "GF119 HDMI Audio Controller", outputs audio fine for my HDMI monitor. Google seems to indicate this is provided by the NVidia card. However, when I try to start jackd over hw:1,3 or hw:1,7 (which aplay -l tells me is the NVidia card), the command outputs the following:
$ jackd -R -d alsa -d hw:1,3
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
no message buffer overruns
no message buffer overruns
no message buffer overruns
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio1
creating alsa driver ... hw:1,3|hw:1,3|1024|2|48000|0|0|nomon|swmeter|-|32bit
ALSA: Cannot open PCM device alsa_pcm for capture. Falling back to playback-only mode
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 2 periods for playback
However, when I try to play sound via Ardour or JackKeyboard, it outputs no sound. This also happens for hw:1,7.
The output of aplay -l is as follows:
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: MID [HDA Intel MID], device 0: ALC887 Analog [ALC887 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: MID [HDA Intel MID], device 1: ALC887 Digital [ALC887 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
Using the hw:0 devices does not work either. I have tried using QJackCtl with an increased buffer size, but to no avail. I've also tried turning pulseaudio's output devices to "Off" and retrying the configuration. I do not know how else to troubleshoot this. I am using Ubuntu Studio 20.04. What does "playback-only" mode mean, and is it the reason why it's not outputting audio? I am using Jack 1.9.12.
