Login Screen won't allow monitor to turn off

This bug was fixed back in 14.04, but is happening again now in 16.04.4.

Here's where it was marked fixed in 14.04:
https://bugs.launchpad.net/bugs/1292041

When the Brightness and Lock times out, both of my monitor's do go off at first, but then my laptop's monitor comes back on permanently showcasing the login screen.

This same bug has ruined two of my Uncle's laptop-monitors (because he leaves his computer on 24/7).

Please fix this again.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.5+16.04.20180221-0ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-43.48~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-43-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset 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 384.111 Tue Dec 19 23:51:45 PST 2017
 GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.9)
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.17
Architecture: amd64
BootLog:

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: Sat May 26 03:15:34 2018
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
GraphicsCard:
 NVIDIA Corporation Device [10de:1be1] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: CLEVO/KAPOK Computer Device [1558:087a]
InstallationDate: Installed on 2018-05-15 (10 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
MachineType: System76 Bonobo WS
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-43-generic.efi.signed root=UUID=a908a8d4-bf97-43cb-9feb-530359002bee ro acpi_backlight=vendor quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/12/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.04RSA5
dmi.board.asset.tag: Tag 12345
dmi.board.name: Bonobo WS
dmi.board.vendor: System76
dmi.board.version: bonw13
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: System76
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.04RSA5:bd12/12/2017:svnSystem76:pnBonoboWS:pvrbonw13:rvnSystem76:rnBonoboWS:rvrbonw13:cvnSystem76:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: Bonobo WS
dmi.product.version: bonw13
dmi.sys.vendor: System76
version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.83-1~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1
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: Fri May 25 21:44:19 2018
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.19.5-0ubuntu2~16.04.1