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[ubuntu] Random freezes on MBP9,2 + Ubuntu 12.04

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http://ubuntuforums.org – I have a MBP9,2 (mid-2012) at work. I put Ubuntu 12.04 on it after some efforts. Everything works more or less now, except I get random freezing every now and then. I have to power off the machine to restore it. Wondering if anyone had the similar issue. My setup: * MacBook Pro 9,2 (mid 2012) * Ubuntu 12.04 (installed using the special image for Macs) * No proprietary drivers * xmonad on Unity 2D * sometimes I hook up a Belkin USB hub to give me more USB ports (Hardware)