I have been using my Raspberry Pi 3 for just over a year and have been running Raspbian and RetroPie on it successfully. I have recently purchased, assembled, and begun using the PiGRRL Zero from the kit https://www.adafruit.com/product/3161, and it’s been great (this is my first Adafruit project and first forum post)! However, the USB Audio Adapter https://www.adafruit.com/product/1475 is not working properly and this tutorial https://learn.adafruit.com/usb-audio-ca ... erry-pi%20’s steps do not return the expected results. The PiGRRL is running a manually tweaked image of RetroPie 4.2 (the latest version), with a USB hub inserted into the single USB port for use of my keyboards (full size Logitech and wireless https://www.adafruit.com/product/922 (although a slightly different model (sorry for the nested parens :) ))), WiFi adapter, and thumb drive for ROM transfer. I have tried removing the USB hub temporarily to see if that was causing the issue, but it did not help. In both configurations, the red LED lights and faint dithering noise can be heard through headphones, but there is no audio from the software itself. Neither dmesg | grep cm109, dmesg | grep Headphone, or dmesg | grep C-Media return anything, and scrolling through the dmesg output did not reveal any information about a specific chipset, although dmesg and lsusb contain lines acknowledging that it has been detected; lsusb’s output reads
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Bus 001 Device 002: ID 1b3f:2008 Generalplus Technology Inc.
Bus 001 Device Device 001: ID 1d6b:0002 Linux Foundation 2.0
root hub
Thanks,
Steven!