Public bug reported:

I have a laptop(dell gaming 5577: intel i7-7700hq and nvidia gtx1050)
and installed ubuntu 16.04.4 LTS, I installed non-free nvidia driver and
intel mircocode. If I use nvidia graphic card, it is normal, but when I
switch to intel graphic card thru prime, then logout, it will black
screen and keyboard, mouse is no response, laptop should be crash.
Reboot is same too. How should I solve it?

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1762112

Title:
  black screen after swith intel  graphic card

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