3D graphics artifact / glitch

[Sam Turner]

The recent 5.8.0-49 update and also the 5.8.0-50 show a 3d graphics glitch. The problem was not present in 5.8.0-48. It seems like faces that are displayed relatively small onscreen suffer from not being displayed properly/invisible. This happens in a variety of apps that use 3D graphics. I have tested in glxgears and the issue is also present. See the attached animated gif.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-50-generic 5.8.0-50.56~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr 28 18:19:09 2021
InstallationDate: Installed on 2020-06-22 (310 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: No upgrade log present (probably fresh install)