This bug was fixed in the package ubuntu-drivers-common - 1:0.4.17.6

---------------
ubuntu-drivers-common (1:0.4.17.6) xenial-proposed; urgency=medium

  * tests/ubuntu_drivers.py:
    - Skip test_system_modaliases_system on s390x.
      Fixes FTBFS (LP: #1728547).

ubuntu-drivers-common (1:0.4.17.5) xenial-proposed; urgency=medium

  [ Alberto Milone ]
  * gpu-manager.{c|py}:
    - Drop the amdgpu-pro code introduced in the previous upload,
      as it will be dealt with in a different upload.

  [ Alex Tu ]
  * gpu-manager.c:
    - Skip bbswitch, and make sure to unload the nvidia driver when
      the force-dgpu-on option is enabled (LP: #1728547).

 -- Alberto Milone <alberto.mil...@canonical.com>  Mon, 22 Jan 2018
12:48:54 +0100

** Changed in: ubuntu-drivers-common (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1728547

Title:
  SRU: Add support for keeping the dGPU on in power saving mode

Status in HWE Next:
  New
Status in OEM Priority Project:
  Fix Committed
Status in ubuntu-drivers-common package in Ubuntu:
  Fix Released
Status in ubuntu-drivers-common source package in Xenial:
  Fix Released
Status in ubuntu-drivers-common source package in Zesty:
  Fix Committed
Status in ubuntu-drivers-common source package in Artful:
  Fix Released

Bug description:
  SRU Request:

  [Impact]
  Some systems don't play well when the dGPU is disabled. It should still be 
possible to use the Intel iGPU without disabling the dGPU.

  [Test Case]
  1) Enable the -proposed repository, and install the new 
"ubuntu-drivers-common"

  2) Make sure the nvidia packages are installed, and enable power saving mode:
  sudo prime-select intel

  3) Restart your computer and attach your /var/log/gpu-manager.log. see
  if the system boots correctly. If unsure, please attach your /var/log
  /gpu-manager.log and /var/log/Xorg.0.log

  4) Install the mesa-utils package:
  sudo apt install mesa-utils

  5) Check the output of the following command (which should mention Intel):
  glxinfo | grep OpenGL

  
  [Regression Potential]
  Low, as the feature is disabled by default. This is only for hardware 
specific workarounds.

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