[Bug 1767196] [NEW] Visualization problem with OpenGL 2.0 compositor, fixed switching to xrender

[Alessandro]

Public bug reported:

Testing with an old machine with a GeForce 6600 I have visualization
problem, black triangle appear over the desktop, in my case it can be
fixed switching the compositor to xRender, so maybe in same case it
should be on xRender by default.

There are as well a resolution that doesn-t fit my actual display LCD TV
and a proper resolution is not available.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic i686
ApportVersion: 2.20.9-0ubuntu7
Architecture: i386
CasperVersion: 1.394
CurrentDesktop: KDE
Date: Thu Apr 26 20:36:32 2018
InstallCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity initrd=/casper/initrd.lz quiet splash --- BOOT_IMAGE=/casper/vmlinuz
LiveMediaBuild: Kubuntu 18.04 LTS "Bionic Beaver" - Release i386 (20180426)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug bionic i386 kubuntu ubiquity-18.04.14

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https://bugs.launchpad.net/bugs/1767196

Title:
  Visualization problem with OpenGL 2.0 compositor, fixed switching to
  xrender

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