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GLX Extension Options Dialog Box

How do I get to this dialog box?

From X Manager or X Manager for Domains or the X Administrative Console

  1. (Administrative Console only) Click the Domain Definitions tab.

  2. In the left pane, select an existing session definition or click next to Sessions Definitions to create a new one.

  3. In the Session Definition pane on the right, click the Extensions tab.

  4. From the Available Extensions list, select GLX, and then click Configure.

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.


If you need to use GLX for older SGI clients, see Enable GLX Compatibility with Older SGI clients.

GLX Extension Options

Option Description
Advertise stereo capabilities Find or advertise any stereo functionality on your video card.
Direct rendering mode Enable direct rendering mode support. If not enabled, use indirect rendering. There are two GLX rendering modes an X client can use to display 3D graphics on an X server: direct and indirect:
Direct rendering: the client renders the image on its own machine (using the Mesa software renderer) and sends the image data to the X server. This offers better performance, and is strongly recommended for the GNOME 3 Desktop. This mode is required if the GLX extension is enabled and the session's Remote session services setting is enabled. It is also required if the GLX extension is enabled and X Manager is running within a Windows remote desktop environment.
Indirect rendering: the client sends GLX protocol and rendering commands to the X server, and the X server runs those commands to render the image. This mode is often slower than direct rendering.
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 advertising only GLX version 1.1.

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