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[Bruce Pieterse <dev@xxxxxxxxxx>]

I just upgraded my Acer Aspire V3-771G with Nvidia GeForce GT630M to
16.04 from 15.10. What I found was the following:

1. If booting with the splash quiet options in GRUB you will get "A start job is running for Hold until boot process finishes up ( 1s / no limit)" on all tty's. Without these parameters in GRUB, you have access to tty1-7 again, which allows for a little more debugging.
2. With the splash and quiet options in GRUB both tty 1 and tty 7 show a black screen. Without these options only tty7 is affected.
3. Removing all nvidia packages with sudo apt-get remove --purge nvidia* and then rebooting works (here I am typing this :)
4. nvidia-340, -346, -352 & -361 always renders a black screen for me. I did not try -331 or -331.
5. If you boot without the splash and quiet options in GRUB, run journalctl -f in one tty and then run systemctl restart gdm.service in another tty I get a segfault in gnome-shell "kernel: gnome-shell[3423]: segfault at 14 ip 00007f893e9a4035 sp 00007ffc392b09f0 error 4 in libmutter.so.0.0.0[7f893e96a000+f2000]" 

I have attached journal output from the time I restarted gdm in a tty
which might have some other info.

** Attachment added: "journal-snippet.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1559576/+attachment/4652251/+files/journal-snippet.log

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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:
  New
Status in Ubuntu GNOME:
  New
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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