Slow to resume from suspend (black screen) while using Nvidia proprietary drivers

[Alexandre Forte]

What I expected to happen: GDM quickly appears after resuming
What happened instead: A black screen appears and GDM is slow to show up

After I suspend my laptop with Ubuntu 18.04.3 by closing it, GDM 3.28.3-0ubuntu18.04.4 takes several seconds to show up when I resume the computer. When the screen is black, only the cursor is visible. I'm using the Nvidia proprietary 430 drivers, but this issue already happened in version 390. If I use the Nvidia panel to switch to Intel graphics, GDM appears immediately after resuming.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.3-0ubuntu18.04.4
ProcVersionSignature: Ubuntu 5.0.0-23.24~18.04.1-generic 5.0.15
Uname: Linux 5.0.0-23-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Aug 9 20:42:15 2019
InstallationDate: Installed on 2019-05-14 (87 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2019-05-14T20:04:13.489887

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

gdm isn't involved in graphics directly so we can probably remove that here...

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.

Ubuntu 18.04 (bionic) reached end-of-standard-support on May 31, 2023.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it anymore. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.