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[Launchpad Bug Tracker <1507676@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-drivers-common - 1:0.4.11

---------------
ubuntu-drivers-common (1:0.4.11) wily; urgency=medium

  * gpu-manager.c:
    - Rely on /var/log/syslog to get information about unloaded modules.
      This should minimise the current slowdown on boot (LP: #1307069).
    - Switch from intel to modesetting as the default driver on hybrid
      intel/nvidia systems because of a regression in the intel driver
      (LP: #1507676).

 -- Alberto Milone <alberto.milone@xxxxxxxxxxxxx>  Mon, 19 Oct 2015
17:35:12 +0200

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

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https://bugs.launchpad.net/bugs/1507676

Title:
  Nvidia-Prime not switching from intel to nvidia leading to a black
  screen

Status in ubuntu-drivers-common package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel package in Ubuntu:
  In Progress

Bug description:
  STEPS:
  1. Install 15.10 on a laptop that supports optimus nvidia/intel hybrid graphics
  2. Install nvidia and nvidia-prime
  3. Open nvidia settings
  4. Switch to nvidia
  5. Log out
  6. Hear the login drums

  EXPECTED:
  I expect to see the lightdm login page

  ACTUAL:
  You are presented with a black page

  TEMP WORKAROUND:
  1. Tap ctrl-alt-f1
  2. login
  3. run sudo prime-select intel
  4. run sudo service lightdm restart
  5. System is back running on the intel stack alone.

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