USB audio pops and crackles

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gabba
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USB audio pops and crackles

Post by gabba » Sun Jun 21, 2020 4:10 pm

Hello,

Running dietpi stretch. HDMI audio works perfectly but I need USB audio out for my DAC to play music/watch films with my current hardware set up.

First issue:
It is difficult to get USB audio out. When I change the settings to my USB DAC in dietpi-config and reboot, there is no audio out and the HDMI still outputs audio. To fix this (https://www.raspberrypi.org/forums/view ... p?t=175233), I altered /usr/share/alsa/alsa.conf with the lines:
defaults.pcm.card 1
defaults.pcm.device 0
defaults.ctl.card 1

This worked but led to my second issue.

Second issue:
Need to plug the USB out and then in to get USB working, then the audio crackles and pops.

To fix this I have tried:
1. Limiting output in Kodi to 44khz
2. Changing all Kodi audio settings as per
3. Playing audio out of Squeezelite (this only worked through HDMI and not USB, even when Kodi could output USB).

I get these kernel errors:

Code: Select all

[  7.103112] usb 1-1.2: unable to read config index 0 descriptor/start: -110
[    7.107457] usb 1-1.2: can't read configurations, error -110
[   12.293067] usb 1-1.2: unable to read config index 0 descriptor/start: -110
[   12.298313] usb 1-1.2: can't read configurations, error -110
[   17.933073] usb 1-1.2: unable to read config index 0 descriptor/start: -110
[   17.938258] usb 1-1.2: can't read configurations, error -110
[   23.043165] usb 1-1.2: unable to read config index 0 descriptor/start: -110
[   23.048184] usb 1-1.2: can't read configurations, error -110
[   23.053595] usb 1-1-port2: unable to enumerate USB device
From my reading, it could have something to do with Odroid C2 USB drivers:
viewtopic.php?t=25434
https://community.volumio.org/t/usb-wav ... id-c2/4873
https://community.volumio.org/t/odroid- ... ssues/5154

I am not running Volumio but my be relevant.

I've been tearing my hair out over this, does anyone have any ideas or have experienced similar problems?

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Re: USB audio pops and crackles

Post by odroid » Mon Jun 22, 2020 10:49 am

Try the latest Volumio image to narrow down root causes.

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