The first command returns this:
Available PCM drivers:
alsa alsa=PLUGIN:CARD,DEV,SUBDEV
Advanced Linux Sound Architecture PCM driver, using
ALSA 1.1.3.
The device specification follows the ALSA device naming
conventions, a detailed description of which is available
at the project's website:
http://alsa-project.org/alsa-doc/alsa-lib/pcm.html
Various ALSA plugins can be used here, 'hw' allows direct
adressing of hardware channels by card, device and subdevice.
PLUGIN - the ALSA plugin, 'default' is usually good enough
CARD - the card number for plugins like 'hw'
DEV - the device number for plugins like 'hw'
SUBDEV - the subdevice number for plugins like 'hw'
Devices (Duplex):
> null - Discard all samples (playback) or generate zero samples (capture)
> pulse - PulseAudio Sound Server
> default - Playback/recording through the PulseAudio sound server
> sysdefault:CARD=PCH - HDA Intel PCH, ALC269VC Analog Default Audio Device
> front:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog Front speakers
> dmix:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog Direct sample mixing device
> dsnoop:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog Direct sample snooping device
> hw:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog Direct hardware device without any conversions
> plughw:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog Hardware device with all software conversions
> sysdefault:CARD=Loopback - Loopback, Loopback PCM Default Audio Device
> front:CARD=Loopback,DEV=0 - Loopback, Loopback PCM Front speakers
> surround21:CARD=Loopback,DEV=0 - Loopback, Loopback PCM 2.1 Surround output to Front and Subwoofer speakers
> surround40:CARD=Loopback,DEV=0 - Loopback, Loopback PCM 4.0 Surround output to Front and Rear speakers
> surround41:CARD=Loopback,DEV=0 - Loopback, Loopback PCM 4.1 Surround output to Front, Rear and Subwoofer speakers
> surround50:CARD=Loopback,DEV=0 - Loopback, Loopback PCM 5.0 Surround output to Front, Center and Rear speakers
> surround51:CARD=Loopback,DEV=0 - Loopback, Loopback PCM 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> surround71:CARD=Loopback,DEV=0 - Loopback, Loopback PCM 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
> dmix:CARD=Loopback,DEV=0 - Loopback, Loopback PCM Direct sample mixing device
> dmix:CARD=Loopback,DEV=1 - Loopback, Loopback PCM Direct sample mixing device
> dsnoop:CARD=Loopback,DEV=0 - Loopback, Loopback PCM Direct sample snooping device
> dsnoop:CARD=Loopback,DEV=1 - Loopback, Loopback PCM Direct sample snooping device
> hw:CARD=Loopback,DEV=0 - Loopback, Loopback PCM Direct hardware device without any conversions
> hw:CARD=Loopback,DEV=1 - Loopback, Loopback PCM Direct hardware device without any conversions
> plughw:CARD=Loopback,DEV=0 - Loopback, Loopback PCM Hardware device with all software conversions
> plughw:CARD=Loopback,DEV=1 - Loopback, Loopback PCM Hardware device with all software conversions
Devices (Output):
> surround21:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog 2.1 Surround output to Front and Subwoofer speakers
> surround40:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog 4.0 Surround output to Front and Rear speakers
> surround41:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog 4.1 Surround output to Front, Rear and Subwoofer speakers
> surround50:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog 5.0 Surround output to Front, Center and Rear speakers
> surround51:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> surround71:CARD=PCH,DEV=0 - HDA Intel PCH, ALC269VC Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
> hdmi:CARD=PCH,DEV=0 - HDA Intel PCH, HDMI 0 HDMI Audio Output
> hdmi:CARD=PCH,DEV=1 - HDA Intel PCH, HDMI 1 HDMI Audio Output
> hdmi:CARD=PCH,DEV=2 - HDA Intel PCH, HDMI 2 HDMI Audio Output
> hdmi:CARD=PCH,DEV=3 - HDA Intel PCH, HDMI 3 HDMI Audio Output
> hdmi:CARD=PCH,DEV=4 - HDA Intel PCH, HDMI 4 HDMI Audio Output
> dmix:CARD=PCH,DEV=3 - HDA Intel PCH, HDMI 0 Direct sample mixing device
> dmix:CARD=PCH,DEV=7 - HDA Intel PCH, HDMI 1 Direct sample mixing device
> dmix:CARD=PCH,DEV=8 - HDA Intel PCH, HDMI 2 Direct sample mixing device
> dmix:CARD=PCH,DEV=9 - HDA Intel PCH, HDMI 3 Direct sample mixing device
> dmix:CARD=PCH,DEV=10 - HDA Intel PCH, HDMI 4 Direct sample mixing device
> dsnoop:CARD=PCH,DEV=3 - HDA Intel PCH, HDMI 0 Direct sample snooping device
> dsnoop:CARD=PCH,DEV=7 - HDA Intel PCH, HDMI 1 Direct sample snooping device
> dsnoop:CARD=PCH,DEV=8 - HDA Intel PCH, HDMI 2 Direct sample snooping device
> dsnoop:CARD=PCH,DEV=9 - HDA Intel PCH, HDMI 3 Direct sample snooping device
> dsnoop:CARD=PCH,DEV=10 - HDA Intel PCH, HDMI 4 Direct sample snooping device
> hw:CARD=PCH,DEV=3 - HDA Intel PCH, HDMI 0 Direct hardware device without any conversions
> hw:CARD=PCH,DEV=7 - HDA Intel PCH, HDMI 1 Direct hardware device without any conversions
> hw:CARD=PCH,DEV=8 - HDA Intel PCH, HDMI 2 Direct hardware device without any conversions
> hw:CARD=PCH,DEV=9 - HDA Intel PCH, HDMI 3 Direct hardware device without any conversions
> hw:CARD=PCH,DEV=10 - HDA Intel PCH, HDMI 4 Direct hardware device without any conversions
> plughw:CARD=PCH,DEV=3 - HDA Intel PCH, HDMI 0 Hardware device with all software conversions
> plughw:CARD=PCH,DEV=7 - HDA Intel PCH, HDMI 1 Hardware device with all software conversions
> plughw:CARD=PCH,DEV=8 - HDA Intel PCH, HDMI 2 Hardware device with all software conversions
> plughw:CARD=PCH,DEV=9 - HDA Intel PCH, HDMI 3 Hardware device with all software conversions
> plughw:CARD=PCH,DEV=10 - HDA Intel PCH, HDMI 4 Hardware device with all software conversions
Devices (PCH - HDA Intel PCH at 0xdfc20000 irq 140):
> hw:0,0 - subdevices: 1*playback (1 busy) + 1*capture (1 busy)
> hw:0,3 - subdevices: 1*playback
> hw:0,7 - subdevices: 1*playback
> hw:0,8 - subdevices: 1*playback
> hw:0,9 - subdevices: 1*playback
> hw:0,10 - subdevices: 1*playback
Devices (Loopback - Loopback 1):
> hw:1,0 - subdevices: 8*playback + 8*capture
> hw:1,1 - subdevices: 8*playback + 8*capture
... and a bit more.
The second command shows this when I try playing a demo:
1536753414.057687 pcm-alsa: ALSA: opening PCM "null" readable=1 writable=1: Failed to configure device buffer
1536753414.062849 pcm-alsa: ALSA: setup: w=0 r=1 n_channels=2 sample_freq=44100 nperiods=4 period=512 (2048) bufsz=2048
1536753414.063541 pcm-alsa: ALSA: setup: w=1 r=0 n_channels=2 sample_freq=44100 nperiods=4 period=512 (2048) bufsz=2048
1536753414.066679 pcm-alsa: ALSA: opening PCM "pulse" readable=1 writable=1: Device configurations mismatch
1536753414.070609 pcm-alsa: ALSA: setup: w=0 r=1 n_channels=2 sample_freq=44100 nperiods=4 period=512 (2048) bufsz=2048
1536753414.071063 pcm-alsa: ALSA: setup: w=1 r=0 n_channels=2 sample_freq=44100 nperiods=4 period=512 (2048) bufsz=2048
1536753414.073042 pcm-alsa: ALSA: opening PCM "default" readable=1 writable=1: Device configurations mismatch
1536753414.077081 pcm-alsa: ALSA: opening PCM "sysdefault:CARD=PCH" readable=1 writable=1: Device or resource busy
1536753414.077321 pcm-alsa: ALSA: opening PCM "front:CARD=PCH,DEV=0" readable=1 writable=1: Device or resource busy
1536753414.077768 pcm-alsa: ALSA: opening PCM "dmix:CARD=PCH,DEV=0" readable=1 writable=1: Open failed
1536753414.078326 pcm-alsa: ALSA: opening PCM "dsnoop:CARD=PCH,DEV=0" readable=1 writable=1: Device or resource busy
1536753414.078454 pcm-alsa: ALSA: opening PCM "hw:CARD=PCH,DEV=0" readable=1 writable=1: Device or resource busy
1536753414.078563 pcm-alsa: ALSA: opening PCM "plughw:CARD=PCH,DEV=0" readable=1 writable=1: Device or resource busy
1536753414.094341 pcm-alsa: ALSA: opening PCM "sysdefault:CARD=Loopback" readable=1 writable=1: Failed to configure device buffer
1536753414.095217 pcm-alsa: ALSA: setup: w=0 r=1 n_channels=2 sample_freq=44100 nperiods=4 period=512 (2048) bufsz=2048
1536753414.095393 pcm-alsa: ALSA: setup: w=1 r=0 n_channels=2 sample_freq=44100 nperiods=4 period=512 (2048) bufsz=2048
1536753414.095435 pcm-alsa: ALSA: opening PCM "front:CARD=Loopback,DEV=0" readable=1 writable=1: OK
1536753414.120227 pcm-alsa: ALSA: retriggering device (r=PREPARED w=PREPARED)...
So it looks like the first device that works for beast in the list is PCM "front:CARD=Loopback,DEV=0". Right?
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