Chrome causing hyperdrive on A8-7410 processor

cpu usage during and after using chrome browser Why is chrome causing one of my cores on my A8-7410 processor to run continuously 92-94 % even when chrome is closed and all background activities disabled? Its в new dell inspiron i5555-428 laptop. гm running Ubuntu 14.04.3 but it only happens in Ubuntu. It doesn't happen in windows 10. Any Ideas, Thanks