Update some information:

On Precision 7730 with NVIDIA GPU, this bug is fixed in graphic driver
nvidia 430.40.

When you installed nvidia 430.40 via .run file that downloaded from
NVIDIA official website, there is no any side effect.

If you installed nvidia 430.44 via .deb or apt (for example: 
https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa), there is a side 
effect:
If the nvidia graphic VID:PID are 10de:1bb5, 10de:1bb9 and 10de:1bbb, the gdm 
could not be started well.
Fortunate, there is a workaround that mark or remove below line in 
/lib/udev/rules.d/71-nvidia.rules.
  ACTION=="add" DEVPATH=="/module/nvidia" SUBSYSTEM=="module" 
RUN+="/usr/bin/nvidia-smi"

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https://bugs.launchpad.net/bugs/1835996

Title:
  Dell Precision 7730 - The screen will be flickering after resumed from
  "display sleep" (ONLY occurs on AUO UHD#8CJK2 panel)

Status in ubuntu-drivers-common package in Ubuntu:
  New

Bug description:
  [Summary]
      Dell Precision 7730 -  The screen will be flickering after resumed from 
"display sleep" (ONLY occurs on AUO UHD#8CJK2 panel)

  [Reproduce Steps]
      1. Install Ubuntu 16.04/18.04 on Precision 7730;
      2. Disable automatic system sleep;
      3. Wait for display to enter sleep;
      4. Resume from display sleep.

  [Results]
      Expected: The screen wakes up as normal;
      Actual: The screen is flickering.

  [Additional Information]
      1. This bug can be reproduced both Dell OEM Ubuntu 16.04 image and 
Canonical Ubuntu 16.04 image (Default video driver/firmware version is 390.25);
      2. This bug still can be reproduced on Ubuntu 18.04;
      3. "apt-get install nvidia current", the video driver/firmware version 
304.135 will be installed. This bug does not appear with this driver;
      4. Also tested version 331 (working properly) and version 384 (This bug 
can be reproduced.);
      5. This bug does not appear on external monitors (working properly via 
WD15 and directly attached);
      6 Same behavior with BIOS 1.4.2;
      7. Similar behavior with RHEL Enterprise Linux Developer Workstation 7.5 
64bit -> No video at all when attempting to resume from display sleep or system 
sleep;
      8. System is working properly using Windows 10 Pro 64bit;
      9. More information from customer:
  
https://www.dell.com/community/XPS/Precision-7730-display-lined-flickering-in-BIOS-DO-NOT-BUY/td-p/6219020

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