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[Rene Greuel <1449560@xxxxxxxxxxxxxxxxxx>]

In the case of the reported ASUS laptop it could be a problem related to the BIOS version, but not in my case. And truely not in the case of a lot of other users.
Simply make a google search with "nvidia prime ubuntu black screen" and filter by date "last month". You will find tenth of results with people discussing about this problem. E.g.:
- https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1362848
It seems that one solution is to enforce "sleep and wake-up" of display after switching to nvidia. Other people are still mentioning the switch to modesetting and deactivation of gpu-manager. Another solution seems to point out switching to gdm, which ends up in avoiding the "sleep/wake-up" problem related to light-dm.
I'm very disappointed that this bug report is handled like an individual problem. A lot of people have this problem and the workarounds are really nasty. It's an important feature for every user owning a laptop with an discrete nvidia card, because on one hand it's reducing the power consumption drastically and on the other hand enabling the full potential of a discrete card.

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https://bugs.launchpad.net/bugs/1449560

Title:
  Cannot login with Nvidia Optimus hardware installed(Ubuntu 15.04)

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  I have Nvidia Optimus GT415M hardware on my laptop.

  I've upgraded my Ubuntu 14.10 where everything was working fine with
  Nvidia Optimus  to Ubuntu 15.04 and now I cannot login. After I type
  the password login screen comes back again.

  I did complete reinstall of NVidia packages and installed new
  nvidia-346 package from Ubuntu repo.

  Looking at Xorg.0.log I see this message:
  [   120.353] (EE) intel(G1): [drm] failed to set drm interface version: Permission denied [13].
  [   120.353] (II) intel(G1): [drm] Contents of '/sys/kernel/debug/dri/0/clients':
  [   120.353] (II) intel(G1): [drm] a dev	pid    uid	magic
  [   120.354] (II) intel(G1): [drm] 
  [   120.354] (II) intel(G1): [drm] y   0  2996     0          0
  [   120.354] (II) intel(G1): [drm] y   0  2996     0          0
  [   120.354] (EE) intel(G1): Failed to claim DRM device.

  And I have found thread regarding this problem on
  https://devtalk.nvidia.com/default/topic/816599/prime-switching-to-
  nvidia-creates-black-screen/. So looks like hardware similar to mine
  need a new version of xserver-xorg-video-intel.

  Could you please help with this.
  --- 
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  346.59  Tue Mar 31 14:10:31 PDT 2015
   GCC version:  gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  CurrentDesktop: KDE
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroRelease: Ubuntu 15.04
  DistroVariant: kubuntu
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 18) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:15a2]
   NVIDIA Corporation GF108M [GeForce GT 415M] [10de:0dee] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:15a2]
  InstallationDate: Installed on 2011-07-25 (1525 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: ASUSTeK Computer Inc. N53Jg
  NonfreeKernelModules: nvidia
  Package: xorg 1:7.7+7ubuntu4
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-28-generic root=UUID=ba2dd780-4798-4649-9a3c-77ff94804d1d ro splash quiet i915.semaphores=1
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  Tags:  vivid possible-manual-nvidia-install kubuntu
  Uname: Linux 3.19.0-28-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin netdev plugdev sambashare
  _MarkForUpload: True
  dmi.bios.date: 10/14/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: N53Jg.206
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: N53Jg
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN53Jg.206:bd10/14/2010:svnASUSTeKComputerInc.:pnN53Jg:pvr1.0:rvnASUSTeKComputerInc.:rnN53Jg:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: N53Jg
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Mon Sep 28 10:27:30 2015
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   intel(G1): [drm] failed to set drm interface version: Permission denied [13].
   intel(G1): Failed to claim DRM device.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                8940 
   vendor                                     AUO
  xserver.version: 2:1.17.1-0ubuntu3.1

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