seems to be related with bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/407824 and http://bugzilla.kernel.org/show_bug.cgi?id=13940
seems to be related with bug /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/407824 bugzilla. kernel. org/show_ bug.cgi? id=13940
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