Hi,
I have a problem on a system where my only sound device is a USB DAC. All
other device driver modules are removed.
The only audio application that should be running is "squeezelite", which
starts as a service. towards the end of the init process.
During init, when the DAC is initialised, I always get a few seconds of white
noise through bot channels. This persists until squeezelite starts, at which
point it becomes silent.
I've been babnging my head trying to figure aout what's going on, without any
success. I can't see any alsa log, but have tried both disabling
alsa-restore.service and manually editing /var/lib/alsa/asound.state to
configure all controls to the minimum volume. So far nothing makes any
difference.
As the noise is muted whenever squeezelite starts, I'm thinking that there
must be something that is simply being initialised wrong on the DAC and that
the fix must be simple.
Can anyone suggest what to try?
aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
default:CARD=PRO
Sanskrit PRO, USB Audio
Default Audio Device
sysdefault:CARD=PRO
Sanskrit PRO, USB Audio
Default Audio Device
front:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
Front speakers
surround21:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
Direct sample mixing device
dsnoop:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
Direct sample snooping device
hw:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
Direct hardware device without any conversions
plughw:CARD=PRO,DEV=0
Sanskrit PRO, USB Audio
Hardware device with all software conversions
squeezelite-R2 -l
Output devices:
null - Discard all samples (playback) or generate
zero samples (capture)
pulse - PulseAudio Sound Server
default:CARD=PRO - Sanskrit PRO, USB Audio - Default Audio
Device
sysdefault:CARD=PRO - Sanskrit PRO, USB Audio - Default Audio
Device
front:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - Front speakers
surround21:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - 2.1 Surround
output to Front and Subwoofer speakers
surround40:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - 4.0 Surround
output to Front and Rear speakers
surround41:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - 4.1 Surround
output to Front, Rear and Subwoofer speakers
surround50:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - 5.0 Surround
output to Front, Center and Rear speakers
surround51:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - 5.1 Surround
output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - 7.1 Surround
output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - IEC958 (S/PDIF)
Digital Audio Output
dmix:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - Direct sample
mixing device
dsnoop:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - Direct sample
snooping device
hw:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - Direct hardware
device without any conversions
plughw:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - Hardware device
with all software conversions
root@pine64:~# systemctl status alsa-restore.service
● alsa-restore.service - Save/Restore Sound Card State
Loaded: loaded (/lib/systemd/system/alsa-restore.service; static; vendor
preset: enabled)
Active: active (exited) since Fri 2017-03-10 11:33:45 CET; 4s ago
Process: 2844 ExecStart=/usr/sbin/alsactl -E HOME=/run/alsa restore
(code=exited, status=0/SUCCESS)
Process: 2841 ExecStartPre=/bin/mkdir -p /run/alsa (code=exited,
status=0/SUCCESS)
Main PID: 2844 (code=exited, status=0/SUCCESS)
Mar 10 11:33:45 pine64 systemd[1]: Starting Save/Restore Sound Card State...
Mar 10 11:33:45 pine64 systemd[1]: Started Save/Restore Sound Card State.
root@pine64:~# systemctl status squeezelite.service
● squeezelite.service - LSB: Lightweight headless Squeezebox emulator
Loaded: loaded (/etc/init.d/squeezelite; bad; vendor preset: enabled)
Active: active (running) since Fri 2017-03-10 11:08:30 CET; 25min ago
Docs: man:systemd-sysv-generator(8)
CGroup: /system.slice/squeezelite.service
└─1059 /opt/squeezelite/squeezelite-R2 -o hw:CARD=PRO,DEV=0 -p 90 -a
20 4 1 -d all debug -f /var/log/squeezelite.log
Mar 10 11:08:30 pine64 systemd[1]: Starting LSB: Lightweight headless
Squeezebox emulator...
Mar 10 11:08:30 pine64 systemd[1]: Started LSB: Lightweight headless Squeezebox
emulator.
Any advice?
BR.
--Marius--
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