Well. Thank you, guys. I appreciate the advice but I reinstall and restore the whole system…
I got another question how to properly install the Nvidia drivers on machines with dual graphics cards, like my laptop?
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) Subsystem: Dell Device 0688 Kernel driver in use: i915 -- 01:00.0 3D controller: NVIDIA Corporation GM204M [GeForce GTX 980M] (rev a1) Subsystem: Dell Device 0688 Kernel modules: nouveau
I have gone through this one Nvidia settings, but someone just told me nvidia-xconfig does not fit the dual graphic drivers.