It's the same problem with the latest kernel (uname -a gives: Linux cerveau 3.3.0-999-generic #201203300409 SMP Fri Mar 30 08:10:21 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux).
It's the same problem with the latest kernel (uname -a gives: Linux cerveau 3.3.0-999-generic #201203300409 SMP Fri Mar 30 08:10:21 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux).