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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1663926 Title: Dell XPS 15 9560 (Nvidia 1050) black screen, Feb 11, 2017 To manage notifications about this bug go to: https://bugs.launchpad.net/nvidia/+bug/1663926/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs