On Tue, Mar 11, 2025 at 02:41:32PM -0400, Geoff Steckel wrote: > I have 2 USB DACs. One uses a Burr-Brown chip and the other > one is a Modi 3+ (custom circuit) from Schiit Audio. > Both work under Linux. > The Schiit seems to accept playback data but no analog output appears. > Both are claimed by uaudio(4). > > Note the lack of a outputs.dac= line for the unhappy unit.
Well, there are many devices with no controls at all, so the lack of output.dac is not wrong. But a mute control with no level control would be surprising design choice. > There are quite a few differences in the USB interface information > especially V1 vs V2 format. > > Is this problem discussed in an online thread somewhere or would > tech@ be interested? I'm not familiar with the details of USB audio (yet). > Would defining UAUDIO_DEBUG help? > yes, I'd be intested in seeing the dmesg output when the device is plugged.
