Volumio 3.807 doesn’t seem to recognize the Chord Mojo 2 as a USB DAC connected to a Raspberry Pi 4. I wasn’t able to find a solution after searching previous posts, and I would appreciate any advice on getting this DAC to work. Thanks!
please provide a system log, so we can check if the USB device is recognized by the RPI at all.
Thanks,
I submitted the entire log - a truncated version appears below.
Fri May 9 07:52:28 PDT 2025
Description=“‘Failure to recognize Chord Mojo 2 as an output device after boot - other DACs (e.g. Topping D10S) work normally.’”
cat /proc/version ---------------
Linux version 6.6.62-v7l+ (dom@buildbot) (arm-linux-gnueabihf-gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0, GNU ld (GNU Binutils for Ubuntu) 2.38) #1816 SMP Mon Nov 18 15:33:33 GMT 2024
cat /etc/os-release ---------------
PRETTY_NAME=“Raspbian GNU/Linux 10 (buster)”
NAME=“Raspbian GNU/Linux”
VERSION_ID=“10”
VERSION=“10 (buster)”
VERSION_CODENAME=buster
ID=raspbian
ID_LIKE=debian
HOME_URL=“http://www.raspbian.org/”
SUPPORT_URL=“RaspbianForums - Raspbian”
BUG_REPORT_URL=“RaspbianBugs - Raspbian”
VOLUMIO_BUILD_VERSION=“147953990fca4aa103a8f90538ef56fb0454638c”
VOLUMIO_FE_VERSION=“e7cae168f9927391640a091813b8a9656b6909b6”
VOLUMIO_FE3_VERSION=“df82a8f23c90a3617c15c55572c8aaea90d8b32a”
VOLUMIO_BE_VERSION=“9ab87de061b3649c303da550e73c92d340b0f989”
VOLUMIO_ARCH=“arm”
VOLUMIO_VARIANT=“volumio”
VOLUMIO_TEST=“FALSE”
VOLUMIO_BUILD_DATE=“Wed 30 Apr 2025 11:47:57 AM CEST”
VOLUMIO_VERSION=“3.807”
VOLUMIO_HARDWARE=“pi”
VOLUMIO_DEVICENAME=“Raspberry Pi”
VOLUMIO_HASH=“fddd10196af80fdc784c726185a6abe4”
ifconfig ---------------
eth0: flags=4163 mtu 1500
inet 192.168.197.196 netmask 255.255.255.0 broadcast 192.168.197.255
ether 2c:cf:67:a4:3e:a2 txqueuelen 1000 (Ethernet)
RX packets 3991 bytes 883932 (863.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1636 bytes 324575 (316.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 737 bytes 103599 (101.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 737 bytes 103599 (101.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
sudo iwconfig ---------------
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
aplay -l ---------------
**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 0: b1 [bcm2835 HDMI 1], device 1: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
lsusb ---------------
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
lsusb -t ---------------
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
lsusb -v ---------------
Couldn’t open device, some information will be missing
Couldn’t open device, some information will be missing
Couldn’t open device, some information will be missing
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.00
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 3
bMaxPacketSize0 9
idVendor 0x1d6b Linux Foundation
idProduct 0x0003 3.0 root hub
bcdDevice 6.06
iManufacturer 3
iProduct 2
iSerial 1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x001f
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
bMaxBurst 0
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x2109 VIA Labs, Inc.
idProduct 0x3431 Hub
bcdDevice 4.21
iManufacturer 0
iProduct 1
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0019
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x1d6b Linux Foundation
idProduct 0x0002 2.0 root hub
bcdDevice 6.06
iManufacturer 3
iProduct 2
iSerial 1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0019
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
we need the link of the complete log
the RPi does not recognize the USB device at all
this is a HW-related problem and not a SW-related one. The Chord Mojo 2 does not have an external PSU input, it could be that the RPi cannot deliver the required power to the device.
please try to connect it to another port, please try with another high-quality cable and eventually please try with a powered USB HUB in between
Thanks - I should have thought of that! I’ll try again with a connected power supply.
All good - the Mojo 2 needs to be connected to a 5v power supply to be recognized by Volumio on the RPi 4. Thank you.
1 Like