I had the same issue on a Lenovo Thinkcentre 93p Tiny running Ubuntu 14.04 x64, but the latest kernel update (3.13.0-32.57) seems to have fixed this.
I had the same issue on a Lenovo Thinkcentre 93p Tiny running Ubuntu 14.04 x64, but the latest kernel update (3.13.0-32.57) seems to have fixed this.