Public bug reported:

I think it's something in the nvidia driver, as I only recently switched
to using nvida v340.106 from using the nouveau package/driver.

the same symptoms as 
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1247189

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.106  Tue Jan  9 15:10:23 
PST 2018
 GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Sun Feb  4 19:51:54 2018
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.13.0-32-generic, x86_64: installed
 nvidia-340, 340.106, 4.13.0-32-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 
09) (prog-if 00 [VGA controller])
   Subsystem: Samsung Electronics Co Ltd 3rd Gen Core processor Graphics 
Controller [144d:c709]
   Subsystem: Samsung Electronics Co Ltd GeForce 710M [144d:c709]
InstallationDate: Installed on 2017-03-09 (331 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 
300E5EV/300E4EV/270E5EV/270E4EV/2470EV/2470EE
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed 
root=UUID=5c64a526-298a-41f4-b7e2-9b47fb5f4405 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/29/2014
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P08RBK
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: NP270E5E-X01AU
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: 
dmi:bvnPhoenixTechnologiesLtd.:bvrP08RBK:bd08/29/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn300E5EV/300E4EV/270E5EV/270E4EV/2470EV/2470EE:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP270E5E-X01AU:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.family: ChiefRiver System
dmi.product.name: 300E5EV/300E4EV/270E5EV/270E4EV/2470EV/2470EE
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.83-1~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.4-0ubuntu1~16.04.4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.4-0ubuntu1~16.04.4
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Sun Feb  4 18:36:36 2018
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 NVIDIA(0): Failed to initiate mode change.
 NVIDIA(0): Failed to complete mode change
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.5-0ubuntu2~16.04.1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu xenial

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1747250

Title:
  I get a blank screen when switching users

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