how do you know what X extensions are available?

[cyran]

Is there's a command-line tool that prints what X extensions are enabled or disabled, or lists what's supported with the current X server version / graphics driver?

There should be some way to know, since Compiz can check for Compositing before it turns on.

[ajmorris]

Is there's a command-line tool that prints what X extensions are enabled or disabled, or lists what's supported with the current X server version / graphics driver?

There should be some way to know, since Compiz can check for Compositing before it turns on.

Hi there,
to check what extensions are being loaded at X startup, you can run the following command:

cat /var/log/Xorg.0.log | grep -i extensions

That will grep your xorg log file for the search term 'extensions' (case insensitive because of the -i paramater on grep) and print out to stdout (your terminal output) what it finds.
For checking what is supported, you can run

glxinfo

and take a look through that at what glx (server and client) extensions are supported, and what opengl extensions are supported.

AJ