Please take a look at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/203251 which sounds like the same issue on different hardware (Toshiba Tecra A9)
Please take a look at https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/203251 which sounds like the same issue on different hardware (Toshiba Tecra A9)