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[Ville Ranki <ville.ranki@xxxxxx>]

This still happens on 15.04. I have a ThinkPad E540 with Optimus
graphics. Plugging in a HDMI display causes display to go blank.

I found this blog posting which explains that the issue is related to
gpu-manager not working correctly:

http://vxlabs.com/2015/02/05/solving-the-ubuntu-14-04-nvidia-346-nvidia-
prime-black-screen-issue/

This bug is a serious for people using laptops with NVidia Optimus as
it's not possible to connect a HDMI monitor to the device. The solution
in post above is way too complicated to be a good workaround.

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Packages, which is subscribed to ubuntu-drivers-common in Ubuntu.
https://bugs.launchpad.net/bugs/1419507

Title:
  gpu-manager writes wrong driver in xorg.conf fro nvidia-prime

Status in ubuntu-drivers-common package in Ubuntu:
  Confirmed

Bug description:
  The driver for the intel part of xorg.conf should be modesetting
  instead of intel, see also: https://askubuntu.com/questions/580693
  /black-screen-when-in-nvidia-mode-after-updating-to-kernel-3-13-0-45

  From what I can see this is set here: http://bazaar.launchpad.net
  /~ubuntu-branches/ubuntu/trusty/ubuntu-drivers-common/trusty-
  proposed/view/head:/share/hybrid/gpu-manager.c#L1588

  I am seeing this on a trusty system with nvidia-346 driver on both
  3.16 and 3.13 kernels.

  The end result of doing this worng is that system boots up with black
  screen.

  As a workaround I have commented out gpu-manager in /etc/init/gpu-
  manager.conf (when starting lightdm) and in /sbin/prime-switch (when
  stopping lightdm).

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