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For those upgrading from Lion and having the CLLocationManager issues (e.g. Security & Privacy not working, Reminder app not working) you can reinstall these packages from the retail disc: Essentials.pkg (may not be necessary, but I did it) BaseSystemBinaries.pkg They're in the SharedSupport folder of the InstallESD.dmg (IIRC). During the install of BaseSystemBinaries.pkg I had to temporarily remove AppleSmartBatteryManager.kext from S/L/E and put it back after (didn't bother running Kext utility when moving it out). WARNING: after BaseSystemBinaries.pkg you need to reinstall Chameleon. I also had to copy over the AppleIntelCPUPowerManagement.kext too. I would reference the post I found this information on, but I can no longer find it! Just found out sound had gone - had to copy AppleHDA.kext back too.
I think this driver solves the 802.11n issues on the AR9285. Check in System Information under the Wifi tab and see what version firmware your card has. Mine had version 2.x.x.x and was exhibiting problems with self assigned IP addresses etc when connecting to n networks. This driver includes a newer 4.x.x.x firmware and my wifi has been fine this morning (not exhaustively tested, but so far so good!). I just took the old kext out, put the new one in (S/L/E) and ran Kext Utility. http://www.osx86.net/view/1299-ar9285_lion.html