drmatt wrote:
> Based on what OS, kernel, and software stack?
>
> The udev system should handle initialisation of the DAC if it's plugged
> in post boot. You should at least see a kernel log message when the DAC
> joins the USB bus, even if no driver subsequently loads to manage it.
Armbian os (xenial) with logsleep (allwinner) kernel 3.10.104 (the only
viable kernel for the pine64 soc device at the moment).
Having posted, I can't reproduce the second scenario now, so please
forget that for the moment.
The white noise is still present though, as soon as alsa loads.
Stack would probably be something like:
1. ehci:
Code:
--------------------
dmesg:
[ 3092.731854] ehci_irq: highspeed device connect
[ 3092.953708] usb 2-1: new high-speed USB device number 2 using sunxi-ehci
[ 3093.181941] usbcore: registered new interface driver usbhid
[ 3093.181952] usbhid: USB HID core driver
[ 3094.710561] input: SMSL AUDIO Sanskrit PRO as
/devices/soc.0/1c1b000.ehci1-controller/usb2/2-1/2-1:1.2/input/input6
[ 3094.712441] hid-generic 0003:0D8C:0062.0001: input,hidraw0: USB HID v1.00
Device [SMSL AUDIO Sanskrit PRO] on usb-sunxi-ehci-1/input2
--------------------
2. ALSA:
Code:
--------------------
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:
Code:
--------------------
squeezelite-R2 -l
Output devices:
null - Discard all samples (playback) or generate
zero samples (capture)
pulse - PulseAudio Sound Server
default
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
--------------------
The default output device for squeezelite is
hw:CARD=PRO,DEV=0 - Sanskrit PRO, USB Audio - Direct
hardware device without any conversions
which obviously causes squeezelite startup to fail when the card is not
found.
I'm thinking that I should modify the startup script for squeezelite to
wait until the hw:CARD=PRO,DEV=0 is present, before starting. Should be
a way of doing that, or taking the squeezelite start script out of init
and link it to a udev rule ???
But I'm sure that I'm not the first to have the problem, so there's
probably a standard solution lying around somewhere, if I can find it.
Regarding the white noise, I'm guessing that alsa is initialising the
device in the wrong mode somehow. Again: any standard solution that may
be missing on my system??
BR.
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