haydn, thank you for reporting this and helping make Ubuntu better.

To confirm this is already fixed in Ubuntu could you please test
http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?

** Description changed:

- 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.
+ After recently changing drivers from nouveau to nvida 340.106 I get a
+ blank screen when switching users.
  
- the same symptoms as 
- 
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1247189
+ WORKAROUND: Use nouveau.
  
  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)
+  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
+  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]
+  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
+  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

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1747250

Title:
  I get a blank screen when switching users

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