Find out if you are on such system run this from terminal: lspci -vnn | grep ‘\”[030[02]\]’ if it gives out something like this with two devices: 00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller]) 01:00.0 3D controller [0302]: NVIDIA Corporation GK107M [GeForce GT 750M] … Continue reading Optimus Notebooks (hybrid graphics)