libSDL1.2 screen tearing still occurs even with version 1.2.15-8ubuntu1.1

[Gannin]

Recently, someone reported a bug with libsdl1.2 where libsdl always used the backingstore, which caused vsync issues. This bug was supposed to have been fixed with the release of libsdl1.2 1.2.15-8ubuntu1.1, however this did not fix the bug.

Even with the most recent libsdl1.2 1.2.15-8ubuntu1.1, screen tearing still occurs when using full-screen OpenGL applications regardless of how the vsync settings are set.

The current workaround is to edit the file:

/usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf

And add the -bs option, so that the file look like this:

[SeatDefaults]
# Dump core
xserver-command=X -bs -core

Adding the -bs option causes everything to vsync properly, including full-screen OpenGL games and applications. But without the -bs option, full-screen OpenGL applications still tear and have vsync issues, even with the latest libsdl1.2 release.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libsdl1.2debian 1.2.15-8ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Jun 5 22:54:10 2014
InstallationDate: Installed on 2014-05-31 (5 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: libsdl1.2
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Jens Höft (jens-hoeft)]

Also affects MythTV (mythbuntu 14.04).