From X Manager, X Manager for Domains, or the X Administrative Console
From this dialog box, you can troubleshoot problems with the rendering of OpenGL graphics. Selecting one or more of the options can help you determine whether or not your video card is faulty.
GLX Extension Options
Advertise stereo capabilities
Find or advertise any stereo functionality on your video card.
Advertise direct rendering
Force Reflection X Advantage to always reply with a 'true' to a glXIsDirect request, even if the renderer context is actually indirect.
Limit to GLX version 1.1
Override the default support for GLX version 1.4 to prevent a client from sending GLX version 1.2 - 1.4 specific protocol. This results in Reflection X Advantage advertising only GLX version 1.1.