USB Audio Devices "disabling" onboard sound cards

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I purchased a USB Turntable(Bus 001 Device 002: ID 08bb:2900 Texas
Instruments Japan) and rebooted my machine.

Lo and behold, I no longer have access to my sound card(00:04.0
Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio
Controller (rev a2)).  It is not even listed in system-config-soundcard.

If I disconnect the USB Turntable and reboot, my audio device becomes
available again.  

Taking a look at my modprobe.conf shows an oddity:
options snd cards_limit=8
alias snd-card-0 snd-intel8x0
options snd-usb-audio index=0
options snd-card-0 index=0
options snd-intel8x0 index=0

The snd-intel8x0 is aliased to snd-card-0, but it doesn't appear.  Quite
strange indeed.  

Seems like a minor bug here as the same thing happens with my USB
headset and my USB webcam(it has a microphone in it).

Any ideas?

Sean



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