I've had the same very problem and it was gone after I've updated nvidia driver from 177 to 180 ( downloaded 180 from https://launchpad.net/~thomas-creutz/+archive , intrepid version)
I've had the same very problem and it was gone after I've updated nvidia driver from 177 to 180 ( downloaded 180 from https:/ /launchpad. net/~thomas- creutz/ +archive , intrepid version)