I had the same problem, It happens from the 169.07 nvidia drivers and newer. I have the same problem also in debian, but semi-solved it using the drivers 169.04 (beta). I'm not sure if they work with the newer X server in Ubuntu.
I had the same problem, It happens from the 169.07 nvidia drivers and newer. I have the same problem also in debian, but semi-solved it using the drivers 169.04 (beta). I'm not sure if they work with the newer X server in Ubuntu.