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Situation: I have upgraded two Nvidia Optimus laptops from Linux Mint 17.3 to version 18.

Problem: After upgrade, Nvidia Optimus does not work, both laptops booted into Cinnamon fallback mode.

Temporary solution: I changed the graphics driver to Nouveau, then the Cinnamon works, but there is an "X" icon in system tray indicating Active graphics card: Unknown. And I obviously need a "real" solution.

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Solution:

sudo apt-get purge bumblebee*
sudo apt-get purge bbswitch*
sudo apt-get purge nvidia*
sudo apt-get --purge autoremove

Afterwards, run driver-manager, install the Nvidia proprietary driver and reboot.

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I solve the problem for me. I deinstalled the microcode driver for intel CPU in driver manager. And after reboot - thats it.

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