Hi @spockfish. Ok didn’t know that re disabling Pi DAC. Can’t be cable issue as the Chord Mojo connects with a cable but the Dragonfly Red just plugs into the USB direct. Neither work. And @David_McNaught I think it was mentioned a Cirrus Key which also plugs in direct if I remember.
Edit…I don’t know if this helps at all but I have a cheap laptop that I have Linux Mint 19.3 XFCE installed and had Roon Bridge on it for a while. Both DACs show every time in Roon with that. I know it is x86 but thought I should add that.
I know it’s working for a whole load of people as I did quite a bit of research first, including Darko.com which sold the idea to me - a small form streaming set up for £50 with a great sound - what’s not to like. That’s why I was surprised I couldn’t get it to work. Maybe something I’m doing but can’t figure it.
In a further twist I just thought I’d plug the Pi back in to check something. Still running Raspbian I just on a whim not expecting anything I plugged in my Dragonfly DAC and I’m now listening to music for the past 15 minutes!! The only thing I did was power it down for about an hour. I suspect when I stop play and swap to my Chord everything will disappear again but at least it answers your question about my USB ports - they seem to work. I was worried about that.
I bought the official USB-C power adapter from Pi Hut with the Pi.
Further update. I swapped out the Dragonfly for the Mojo. Recognised by Roon and worked. It went flat (listening too much!) so swapped back to Dragonfly and still recognised and working perfectly. Also I ran aplay -l and now output lists all sound cards properly with detail including the USB connection.
I was trying the Dragonfly again as the Chord needs charging. But in the morning I’ll try a reboot and use the Chord first.
Edit…as a last attempt tonight to try and figure out what was going on I ran dmesg and saw lots of entries “xHCI host controller not responding, assume dead, HCI died, cleaning up” everytime I moved the Dragonfly around the USB ports. A bit of searching brought me to an Arch forum where they were discussing this in relation to a kernel bug which essentially is putting the USB ports to sleep randomly. It seems to get fixed and then breaks with a new kernel release. I ran rpi-update to get the latest kernel (ends 102) and tried the Dragonfly and it appeared in Roon. Moved USB port - still there. Rebooted and still there. I’ll keep you posted.