The same observed with NVIDIA 470.86 driver.
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https://bugs.launchpad.net/bugs/1877226
Title:
nvidia - external display unavailable after screen goes to sleep
Status in gnome-control-center package in Ubuntu:
Confirmed
Status in mutter package in Ubuntu:
Confirmed
Status in nvidia-graphics-drivers-440 package in Ubuntu:
Confirmed
Bug description:
On ubuntu 20.04 (Linux 5.4.0-29-generic #33-Ubuntu SMP Wed Apr 29
14:32:27 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux) with nvidia
proprietary driver 440.64 with an nvidia MX250 (Lenovo T590):
1) Attach monitor via HDMI
2) Monitor is properly detected. Gnome-control-center sees the
correct monitor and sets it to join displays. No issue
3) activate lock screen (window key + L)
4) wait for screens to go to sleep
5) wake up screens to login again (external monitor flashes briefly)
6) login
7) system no longer uses external display and returns to single
display
8) open gnome-control-center -> displays. Single Display is active
9) Attempt to select join displays
10) Error at the top of gnome-control-center: Changes cannot be
applied - This could be due to hardware limitations
11) select mirror - click apply
12) a keep settings dialogue will pop-up briefly before the screen
goes blank. When the screen comes back on, both screens come back on,
with a new keep settings dialogue.
13) select keep settings. gnome-control-center now shows Joing
Displays as being active. not/not mirror.
Notes:
-changing prime-select to nvidia vs adaptive does not change the issue
-setting power profile to performance in nvidia-settings does not change the
issue
gnome-control-center info:
Installed: 1:3.36.1-1ubuntu5
Candidate: 1:3.36.1-1ubuntu5
Version table:
*** 1:3.36.1-1ubuntu5 500
500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
nvidia-driver-440:
Installed: 440.82+really.440.64-0ubuntu6
Candidate: 440.82+really.440.64-0ubuntu6
Version table:
*** 440.82+really.440.64-0ubuntu6 500
500 http://de.archive.ubuntu.com/ubuntu focal/restricted amd64
Packages
100 /var/lib/dpkg/status
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.1-1ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu May 7 06:16:15 2020
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2020-04-24 (12 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
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