This seems to be a duplicate problem as [0], and has a Kernel BugZilla entry [1].
Appending "ec_intr=0" to the kernel parameters fixed this for me. [0] https://bugs.launchpad.net/ubuntu/+source/casper/+bug/107516 [1] http://bugzilla.kernel.org/show_bug.cgi?id=8246 -- Chris Lamb, Leamington Spa, UK GPG: 0x634F9A20
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