I don't have any problems with this bug anymore on Natty. So I can
confirm that this is fixed for me with alsa-lib - 1.0.24.1-0ubuntu4.

@ David Henningsson
Thank you for your tip with the ttable entries. I was not possible to make a 
mapping through via-ice1712.conf (but perhaps I just did something wrong), but 
changing /usr/share/alsa/cards/ICE1712.conf works to allow simultanuous output 
on channels 1-4. Here the relevant section in 
/usr/share/alsa/cards/ICE1712.conf, where I added the two lines you suggested:
<confdir:pcm/front.conf>

ICE1712.pcm.front.0 {
        @args [ CARD ]
        @args.CARD {
                type string
        }
        type asym
        playback.pcm {
                type route
                ttable.0.0 1
                ttable.1.1 1
                ttable.0.2 1
                ttable.1.3 1

Thanks a lot

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https://bugs.launchpad.net/bugs/178442

Title:
  Pulseaudio fails to initialize ICE1712 chipsets

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