This is the relevant section of the dmesg that was posted: uaudio0 at uhub3 port 2 configuration 1 interface 1 "Cyrus Audio Cyrus soundKey" rev 2.00/1.00 addr 4 uaudio0: class v1, full-speed, async, channels: 2 play, 0 rec, 2 ctls audio1 at uaudio0 uhidev0 at uhub3 port 2 configuration 1 interface 2 "Cyrus Audio Cyrus soundKey" rev 2.00/1.00 addr 4 uhidev0: iclass 3/0 uhid0 at uhidev0: input=64, output=64, feature=0
Judging by the second line, it's a class 1 async device? By comparison, this is the UAC1 DAC (Behringer UCA200) I use on an xhci bus with no problems, except no recording support: xhci3 at pci7 dev 0 function 0 "Renesas uPD720202 xHCI" rev 0x02: msi, xHCI 1.0 usb3 at xhci3: USB revision 3.0 uhub3 at usb3 configuration 1 interface 0 "Renesas xHCI root hub" rev 3.00/1.00 addr 1 .. uaudio1 at uhub3 port 3 configuration 1 interface 1 "Burr-Brown from TI USB Audio CODEC" rev 1.10/1.00 addr 2 uaudio1: class v1, full-speed, sync, channels: 2 play, 2 rec, 3 ctls audio1 at uaudio1 uhidev1 at uhub3 port 3 configuration 1 interface 3 "Burr-Brown from TI USB Audio CODEC" rev 1.10/1.00 addr 2 uhidev1: iclass 3/0 uhid1 at uhidev1: input=1, output=0, feature=0 -- Patrick Harper paia...@fastmail.com On Fri, 7 Aug 2020, at 11:31, Alexandre Ratchov wrote: > On Fri, Aug 07, 2020 at 10:08:25AM +0100, Patrick Harper wrote: > > I think asynchronous transfers don't work with xhci right now, which > > appears to be how your DAC works. If you can disable USB 3.0 in the > > BIOS/UEFI setup program it should work. > > > > This device is usb1.1, it uses control and isochronous transfers that > xhci supports. Strangely, even certain control transfers fail with > this particular device. >
