> The main problem with the device being detected as a surround device
is that the controls in PulseAudio don't match (and that it adds a non-
existent Subwoofer line). But apart from that, it works well when I turn
it on before booting to Ubuntu, so the "surround problem" is not a vital
problem.

http://git.alsa-project.org/?p=alsa-
lib.git;a=blob_plain;f=test/chmap.c;hb=HEAD

post the output of

chmap -D hw:U46DJ   query

do you mean you want to change the channel map of your 6 channels U46DJ
?

> The annoying problem is that I have to turn on the U46DJ before
booting to Ubuntu. Otherwise, the outputs will not be detected. So if I
forgot to turn it on, I'll need to do a reboot.

you only need to logout or restart the pulseaudio server

do you mean pulseaudio does not get the hotplug event when your u46dj is
power on ?

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https://bugs.launchpad.net/bugs/1242615

Title:
  [USB-Audio - U46DJ] Not correctly recognized and no outputs

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