Solution USBridge and some DACs (Dragonfly and USB 1.1 DACs)

[volumio]

Starting from Volumio 2.348, a new improved USB driver is included on the Sparky image, which will fix a problem with some USB DACs (no sound output).

If your DAC (such as the Dragonfly) produces no sound, do this to fix it:

• Enable SSH volumio.github.io/docs/User_Manual/SSH.html
• Execute this command :

sudo nano /boot/uenv.txt

• Locate the line

aotg.aotg1_speed=0

and change it to

aotg.aotg1_speed=1

If you can’t find such line, just add it.

• Save with ctrl and x
• Reboot

This is the official comment from ALLO

Sparky image has USB 1.1 mode selection module parameter(aotg.aotg1_speed ) added for USBridge port ,
aotg.aotg1_speed=0 for USB 2.0 mode (default)
aotg.aotg1_speed=1 for USBridge on usb 1.1 mode

This parameter to be included on /boot/uenv.txt

This setting required for working DragonFly dacs on sparky USBridge.

Please report here if changing this setting solved your issue.

[simis307]

Hi,

I have tried this solution on a new USBridge with my KEF X300AW. Unfortunately still no sound (only cracks and pops).

After adding the proposed line, the content of the uenv.txt is:

uenvcmd=setenv os_type linux;
bootargs=earlyprintk clk_ignore_unused selinux=0 scandelay console=ttyS3,115200n8 console=tty0 loglevel=0 real_rootflag=rw root=/dev/mmcblk0p2 rootwait imgpart=/dev/mmcblk0p2 imgfile=/volumio_current.sqsh
aotg.aotg1_speed=1

Is that correct?

Thanks.

[simis307]

I also tested with a Dragonfly Black and initially had the same issue. However, I edited the uenv.txt file again to append the new parameter at the end of the existing line instead of putting it on a new line. This seems to have solved the issue for the Dragonfly since it now works nicely.

The issue remains for the KEFs however: no sound. (FWIW there’s no issue when connecting them to a laptop.)