SUSE LINUX Documentation - Index of

286 Reference
To verify the X.Org configuration, the tool checks if the packages needed for 3D support
are installed and if the correct OpenGL library and GLX extension are used. Follow
the instructions of 3Ddiag if you receive failed messages. If everything is correct, you
only see done messages on the screen.
14.4.4 OpenGL Test Utilities
For testing OpenGL, the program glxgears and games like tuxracer and
armagetron (packages have the same names) can be useful. If 3D support has been
activated, it should be possible to play these smoothly on a fairly new computer.
Without 3D support, these games would run very slowly (slideshow effect). Use the
glxinfo command to verify that 3D is active, in which case the output contains a
line with direct rendering: Yes.
14.4.5 Troubleshooting
If the OpenGL 3D test results are negative (the games cannot be smoothly played), use
3Ddiag to make sure no errors exist in the configuration (failed messages). If correcting
these does not help or if failed messages have not appeared, take a look at the X.Org
log files.
Often, you will find the line DRI is disabled in the X.Org file /var/log/Xorg
.0.log. The exact cause can only be discovered by closely examining the log file—a
task requiring some experience.
In such cases, no configuration error exists, because this would have already been detected
by 3Ddiag. Consequently, at this point, the only choice is to use the software
rendering fallback of the DRI driver, which does not provide 3D hardware support.
You should also go without 3D support if you get OpenGL representation errors or instability.
Use SaX2 to disable 3D support completely.
14.4.6 Installation Support
Apart from the software rendering fallback of the DRI driver, some OpenGL
drivers in Linux are still in developmental phases and are therefore considered experimental.
The drivers are included in the distribution because of the high demand for 3D
hardware acceleration in Linux. Considering the experimental status of some OpenGL