I experience the same bug too, using Karmic AMD64 and CA0106 Soundcard
(Soundblaster Audigy).
01:09.0 Multimedia audio controller: Creative Labs CA0106 Soundblaster
Subsystem: Creative Labs Device 100a
Flags: bus master, medium devsel, latency 32, IRQ 19
I/O ports at 9000 [size=32]
Capabilities: [dc] Power Management version 2
Kernel driver in use: CA0106
Kernel modules: snd-ca0106
CPU goes up to 100% randomly when I use the card in 5.1 - it never
happens when set to Stereo Output and it is also OK if I disable the
lfe-upmix. Playing music via Rythmbox ore Banshee doesn't trigger it,
but if I watch a 5.1 movie in totem or DVB-T via xine-sxfe it happens in
about 5 to 20mins, sometimes it takes even an hour.
When I switch to my onboard Realtek Sound it doesn't happen.
All packages are up to date. Everything was fine in Jaunty. I experience this
since I updated to Karmic (3 days before oficial release).
For me it seems like this is something with the lfe-upmix option.
If I can provide you with any further information let me know.
--
pulseaudio takes randomly 100 % CPU
https://bugs.launchpad.net/bugs/466957
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