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OK, if the 8738 driver recompiled under Leopard does not work, then I guess the next step would be to try a linux codec dump with Taruga's AppleHDA patcher (if someone hasn't already given this a shot yet). CMI8788 cards are now very well supported under linux since the OSS ALSA driver folks started rewriting the drivers for these cards from scratch about 6 months ago. So obviously use the latest ALSA drivers when creating the codec dump.
I don't actually own a CMI8788 based card but am looking to get a Xonar D2 to replace the onboard mobo audio (ALC889a, working) on my Gigabyte X48 board. Has anyone tried the CMI8738 driver, which apparently also works for CMI8768 based sound cards? See the end of this thread for a 10.5 recompiled driver: Cmedia 8738 Even if the driver is partially working (am only looking to use the front channel analog outputs), I would probably spring for the Xonar D2 card. If someone could give it a shot and post back with their results, that would be great.