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I have this problem with my Lenovo IdeaPad Core17, Intel HD and Nvidia GT750M graphics card running a dual boot of Ubuntu 16.04 and Windows 10. On Windows everything works fine but on Ubuntu, HDMI isn't working for external monitors and I'm getting a black screen if I close the lid or suspend the laptop which forces a hard power off.

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From question's revision #1:

  1. First check the recommended nVidia drivers .

    sudo ubuntu-drivers devices

  2. Install the recommended driver, in my case, it were nvidia-418.

    sudo apt-get install nvidia-418

  3. Install nvidia-prime and nvidia-settings

    sudo apt-get install nvidia-prime nvidia-settings

  4. Reboot. You will probably get into a login loop.

  5. If 4 above happens edit /etc/default/grub and look for the line

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

    and remove nomodeset.

    This was only necessary when installing Ubuntu. Now it's just causing your video drivers not to be loaded.

  6. Run

    sudo update-grub

HDMI should work now. If the audio stops working, run

pulseaudio -k

and then go to System Settings→Sound and set HDMI as default audio.

Links That helped me:

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