Hello, I had the same problem, but I could solved my case:
Gigabyte Notebook with hybrid Intel + Nvidia GTX 765M card with PRIME not 
working with (K)Ubuntu 16.04 with any version of the proprietary NVIDIA driver. 
When prime-select switched to nvidia gives a black screen, set to intel worked. 
NVidia proprietary driver prime-select set to nvidia worked on (K)Ubuntu 14.04 
before.

The solution that worked for me (with latest stable driver 367.57, from
graphics ppa, but should work with every driver) was to change
xorg.conf!

The version of Xorg shipped with (K)Ubuntu 16.04 is 1.18.4, where the BusID 
format in xorg.conf was slightly changed in Xorg >= 1.17.2.
I changed `BusID "PCI:1@0:0:0"` on the nvidia card to `BusID "PCI:1::0:0"` and 
similar process on the intel section and also added the LoadModule setting. 
Like described in an answer to a post on askubuntu. see: 
http://askubuntu.com/a/776527

I guess the broken id works on PRIME set to intel because autodetection
in single-intel mode is much better then the Nvidia PRIME stuff.

After restart it worked, but something changed my xorg.conf again to
have invalid data. I'm now experimenting with deactivating gpu-manager
by commenting all lines in /etc/init/gpu-manager.conf (see
https://vxlabs.com/2015/02/05/solving-the-ubuntu-14-04-nvidia-346
-nvidia-prime-black-screen-issue/ ) and setting "chattr +i" for
xorg.conf.

and see ArchWiki:
https://wiki.archlinux.org/index.php/NVIDIA_Optimus#Using_nvidia

Hope this solves your problems with NVidia PRIME too!

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1559576

Title:
  Ubuntu GNOME boots to black screen when using proprietary Nvidia
  drivers on a laptop with Optimus

Status in gdm:
  Confirmed
Status in Ubuntu GNOME:
  Triaged
Status in gdm3 package in Ubuntu:
  Triaged
Status in linux package in Ubuntu:
  Invalid
Status in gdm3 source package in Xenial:
  Triaged
Status in linux source package in Xenial:
  Invalid

Bug description:
  Using latest Ubuntu Gnome x64 daily build with all updates installed. 
  Lenovo Z70-80 laptop with Nvidia 840M, BIOS updated to latest version, secure 
boot and other potentially problematic BIOS settings disabled.

  Can only see a black screen instead of a log-in screen after boot completes 
when proprietary Nvidia drivers are installed.
  Regular Ubuntu works absolutely fine on the same machine with the same driver 
version. Attempting to use older drivers on Ubuntu Gnome made no difference.

  Bug is affecting more than just me. We were talking about workarounds
  in ubuntuforums. User fthx claims that switching to lightdm fixes the
  issue
  http://ubuntuforums.org/showthread.php?t=2317628&p=13457703#post13457703

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-14-generic 4.4.0-14.30
  ProcVersionSignature: Ubuntu 4.4.0-14.30-generic 4.4.5
  Uname: Linux 4.4.0-14-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Sat Mar 19 23:19:21 2016
  HibernationDevice: RESUME=UUID=4f8fb76c-f99d-4c54-8a67-eed0653d8eb6
  InstallationDate: Installed on 2016-03-19 (0 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 
(20160318)
  MachineType: LENOVO 80FG
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-14-generic.efi.signed 
root=UUID=572a19f6-7324-4269-ad36-7ffc9919f7a2 ro noprompt persistent quiet 
splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-14-generic N/A
   linux-backports-modules-4.4.0-14-generic  N/A
   linux-firmware                            1.156
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/22/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: ABCN96WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: Lenovo Z70-80
  dmi.board.vendor: LENOVO
  dmi.board.version: NO DPK
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Z70-80
  dmi.modalias: 
dmi:bvnLENOVO:bvrABCN96WW:bd09/22/2015:svnLENOVO:pn80FG:pvrLenovoZ70-80:rvnLENOVO:rnLenovoZ70-80:rvrNODPK:cvnLENOVO:ct10:cvrLenovoZ70-80:
  dmi.product.name: 80FG
  dmi.product.version: Lenovo Z70-80
  dmi.sys.vendor: LENOVO

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