In my case, it is most likely this bug:
https://bugzilla.kernel.org/show_bug.cgi?id=156341

When the nvidia card is disabled with bbswitch, running lspci causes an
immediate freeze. Of curse, if I'm not running lspci, the freeze will
occur sooner or later anyway.


** Bug watch added: Linux Kernel Bug Tracker #156341
   http://bugzilla.kernel.org/show_bug.cgi?id=156341

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Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1663926

Title:
  Dell XPS 15 9560 (Nvidia 1050) black screen, Feb 11, 2017

Status in Nvidia:
  New
Status in nvidia-prime package in Ubuntu:
  Confirmed

Bug description:
  There have been multiple reports that "nvidia-prime select intel" results in 
a black screen on the new Dell XPS 15 (9560, with Nvidia 1050)
  See the following threads:

  1. (initial report). 
  
https://www.reddit.com/r/Ubuntu/comments/5qjq4v/dell_xps_15_kaby_lake_w_nvidia_1050_review_2017/

  2. (lots of confirmations of the same thing)
   
https://www.reddit.com/r/Dell/comments/5rxb5x/any_dell_xps_15_9560_linux_users/ 

  3. (additional confirmation)
  
https://www.reddit.com/r/Dell/comments/5t2b5d/high_cpu_temp_and_fan_usage_for_ubuntu_on_9560/

  4. (reported on Nvidia forums)
  
https://devtalk.nvidia.com/default/topic/991853/complete-freeze-with-nvidia-prime/

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