Created attachment 143032
dmesg from thinkpad x1 extreme / GTX 1050 Ti on kernel 4.20 with discrete only 
graphics

Not sure if that helps with the diagnostics, but on the same Thinkpad X1
Extreme laptop with "Discrete only" BIOS setting, lspci works fine, X
starts and works, but there's a timeout logged by nouveau.

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https://bugs.launchpad.net/bugs/1729736

Title:
  10de:1c8c [MSI] Module nouveau fails to manage GeForce GTX 1050 Ti
  Mobile

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Trying to use 'Nvidia GeForce GTX 1050 Ti Mobile' with 'Ubuntu 17.10
  (Artful)' :

  - Linux kernel 4.13.0-16 from 'Ubuntu 17.10 (Artful)' systematically
  fails (1 CPU stuck).

  - Linux kernel 4.14.0-041400rc7 from http://kernel.ubuntu.com/~kernel-
  ppa/mainline seems to succeed.

  See attached kern.log

  
  After reboot on Linux kernel 4.13.0-16 with nouveau blacklisted :

  $ lspci -nn -v -s 1:0.0

  01:00.0 3D controller [0302]: NVIDIA Corporation GP107M [GeForce GTX 1050 Ti 
Mobile] [10de:1c8c] (rev a1)
        Subsystem: Micro-Star International Co., Ltd. [MSI] GP107M [GeForce GTX 
1050 Ti Mobile] [1462:11c8]
        Flags: bus master, fast devsel, latency 0, IRQ 255
        Memory at de000000 (32-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at e000 [disabled] [size=128]
        Expansion ROM at df000000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel modules: nvidiafb, nouveau

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