I am also having a similar problem when connecting to an Ubuntu 7.10 box from 
another using ssh -X. 
GLX  apps work on the client but when running a glx app from the ssh server I 
get the following errors:
libGL error: open DRM failed (Operation not permitted)
libGL error: reverting to (slow) indirect rendering

The is no problem when doing the same using an old SuSE server and the
same client.

Output from glxinfo running on the Ubuntu server is attached.


** Attachment added: "glxinfo output"
   http://librarian.launchpad.net/7850034/glxinfo%20output

-- 
[Feisty] LTSP:  libGL error: open DRM failed
https://bugs.launchpad.net/bugs/110009
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