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Just switch your layoutid in your config file from 13 to 11 should fix the audio issue Also good idea to update Lilu.kext, AppleALC.kext and Whatevergreen.kext. Your version of Clover can / should be updated too

If anyone is still having problems with this the brightness function on the arrow keys of my E6230 works fine by patching the BRT6 method in the DSDT. This looks like it should be applicable to most Latitude models as many use the same brightness control method. Open your DSDT source file in MaciASL, click Patch, paste the code below in the top section and click apply.