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After updating to MB 6.2.1 on a AsRock x79 Extreme4 with Core i7 3820 running 10.9.2 installed with 6.1 (DSDT Free), everything was cool. So I tried Mac Pro profile 6,1. ALC898 then stopped working (volume bar remained active and adjustable, simply with no sound). Setting back to 5,3 it worked...

iTunes 11.1.5 today updated IOGraphicsFamily.kext, IONDRVSupport.kext, IOPCIFamily.kext and System.kext. Though Multibeasted AppleHDA.kext and HDAEnabler1.kext remained untouched, sound said byebye. ALC892 is already reported, but for ALC898 is the same, probably for others, as well...

Same here guys with ALC898 (AsRock x79 Extreme4). iTunes 11.1.5 today updated IOGraphicsFamily.kext, IONDRVSupport.kext, IOPCIFamily.kext and System.kext. Though Multibeasted AppleHDA.kext and HDAEnabler1.kext remained untouched, sound said byebye. macinme: If you applied only the linked...