Blurred texts, icons and character typed on login screen after logout or switching user

[Sidney Lins]

I login to my account normally. But, when I click on "switch user" from app indicator, the clock in login screen will be completely blurred, impossible even to perceive it is a clock/time, except if I wait one minute so that the last number will update and it will show correctly (only the last number).

If I press enter or click-up, I see the login form with the same problem: I can see that there are two users but they are completely indistinguishable and blurred. If I click on it, I can type my password but still blurred, even the chars I type are blurred.

The app indicator icons are blurred too, but when I put the cursor over them, instantly they are fixed.

PS: I have two enabled monitors and two users, but the second user is not logged in.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lightdm (not installed)
ProcVersionSignature: Ubuntu 5.4.0-9.12-generic 5.4.3
Uname: Linux 5.4.0-9-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Jan 13 00:13:45 2020
InstallationDate: Installed on 2019-12-31 (13 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191230)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Sidney Lins (sdlins)]

I tested using log-out from app indicator and the problem also happens.

PS: This is the only thing preventing me to migrate to 20.04 definitely right now. This version is very clean and fast!

[Sidney Lins (sdlins)]

I cant reproduce this bug anymore since last updates.

[Sidney Lins (sdlins)]

It happened again. So, I should expect that ocassionally it will happen again till to be fixed.