https://bugs.freedesktop.org/show_bug.cgi?id=92754
--- Comment #8 from Raymond <[email protected]> ---
Usb-audio.conf does not defined its own surround21
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/cards/USB-Audio.conf;hb=HEAD
The surround21 use surround51 but your card does not support 6 channels
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/pcm/surround21.conf;hb=HEAD
This mean you have to define your card specific 2.1 in usb-audio.conf
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