The laptop model is `Asus N501JW` running `Ubuntu 18.04`. The discrete GPU is `GeForce GTX 960M`. The link below says that by default the system uses `Intel HD graphics` (the iGPU) and using the discrete GPU requires a proprietary driver! Does this mean that having `nouveau` is not enough? https://askubuntu.com/a/766282/926952
It seems that I was wrong and only one GPU is being used?!