Quote Originally Posted by bridgman View Post
Not sure if this is your problem, but you need a fairly recent version of glxinfo (in mesa demos) to create core contexts - otherwise it only shows 3.0.

https://bugs.freedesktop.org/show_bug.cgi?id=61419
Thanks. Doesn't look like that's the problem, though. Currently installed mesa-utils is 8.1.0-0ubuntu1~precise1.

Following the comments in the bug report I see GL_ARB_texture_buffer_object isn't advertised but I'm using xserver 1.12, so it could be that.