Public bug reported:

Lenovo ThinkPad W540 docked with an ultradock. 3 external displays
running on VGA, DVI and display port all connected to the dock. BIOS
mode set to run external displays ONLY with nvidia chipset. prime-select
nvidia run.

When running under 4.15.0-36-generic with nvidia 390.77-0ubuntu0.18.04.1
I boot and all three external displays run fine.

Upgrading to 4.15.0-38 and Xorg starts up, but none of the displays
light up.

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


** Tags: bionic

** Summary changed:

- Xorg loads, no display
+ Xorg loads, no display on 4.15.0-38, works on 4.15.0-36

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https://bugs.launchpad.net/bugs/1799994

Title:
  Xorg loads, no display on 4.15.0-38, works on 4.15.0-36

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Lenovo ThinkPad W540 docked with an ultradock. 3 external displays
  running on VGA, DVI and display port all connected to the dock. BIOS
  mode set to run external displays ONLY with nvidia chipset. prime-
  select nvidia run.

  When running under 4.15.0-36-generic with nvidia
  390.77-0ubuntu0.18.04.1 I boot and all three external displays run
  fine.

  Upgrading to 4.15.0-38 and Xorg starts up, but none of the displays
  light up.

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