I also have the same issue using 18.04 (clean install) 4.15.0-22-generic, with 
the following graphics using Nvidia 390
:

01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750 
Ti] (rev a2) (prog-if 00 [VGA controller])
        Subsystem: eVga.com. Corp. GM107 [GeForce GTX 750 Ti]
        Flags: bus master, fast devsel, latency 0, IRQ 31
        Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at e000 [size=128]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Legacy Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [250] Latency Tolerance Reporting
        Capabilities: [258] L1 PM Substates
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 
<?>
        Capabilities: [900] #19
        Kernel driver in use: nvidia
        Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

Display is a Dell P2415Q connected using displayport. Very occasionally
it comes back after the CPU has suspended, but mostly not.

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1760113

Title:
  System does not display video after waking up from sleep

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  I'm using the latest daily development snapshot iso of Ubuntu Bionic
  Beaver.

  My issue is that after issuing a sleep command with systemctl suspend
  -i, the system cannot doesn't display any video or seems to work at
  all when waking it up. It does detect the keypress of my keyboards,
  because the fans will start spinning up and the HDD LED will flicker,
  confirming that it did wake up, but I can't do anything with it. All I
  could do was to shut off the computer entirely with my hardware
  button.

  As this was my first bug report I'm willing to provide any more
  debugging information, I just don't know how. I'm using a desktop
  computer and I'm certain the motherboard supports this sleep state and
  it worked fine in previous versions of several linux distros. I blamed
  the error to xorg in particular because it seems to be waking up, it
  just won't start up my screens.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu5
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Es un directorio: 
'/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  390.48  Thu Mar 22 00:42:57 
PDT 2018
   GCC version:  gcc version 7.3.0 (Ubuntu 7.3.0-13ubuntu1)
  .proc.driver.nvidia.warnings.fbdev:
   Your system is not currently configured to drive a VGA console
   on the primary VGA device. The NVIDIA Linux graphics driver
   requires the use of a text-mode VGA console. Use of other console
   drivers including, but not limited to, vesafb, may result in
   corruption and stability problems, and is not supported.
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  BootLog: Error: [Errno 13] Permiso denegado: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar 30 15:47:01 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  DkmsStatus: nvidia, 390.48, 4.15.0-13-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation GM206 [GeForce GTX 950] [10de:1402] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd GM206 [GeForce GTX 950] [1458:36c5]
  InstallationDate: Installed on 2018-03-30 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180329)
  MachineType: System manufacturer System Product Name
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic 
root=UUID=cf158901-6c71-4345-89dd-371337d8426a ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/09/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2301
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A88TD-V EVO/USB3
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2301:bd08/09/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A88TD-VEVO/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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