You're positive you did everything you needed to to change your kexts? Something must be different. When I change kexts, I usually use the OSx86Tools application to make sure I've remembered everything. I usually check the following;

Set Extensions Permissions
Clear Extensions Cache
Touch Extensions Folder

...then I click "Run Selected Tasks," and reboot. Always works for me.

I currently know of no other way to get 5.1 sound working with an 889a, and in fact I have not done so myself. So far, I've only checked four channels in and out.

Also, notice your dumps both say 885. I'm not sure why they work under linux better than they would on OSx86. We'll just have to wait patiently for help from Taruga.

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Gigabyte GA-EP35-DS4 Rev. 2.1 • EVGA Nvidia 8800GT 512 • 4GB Geil DDR2 667 • Samsung SH-S223F DVD Burner • Seagate Barracuda ES 750GB SATAII • iDeneb 1.3 (10.5.5) • ...and a Smug Grin