I tried it with an X server on an up-to-date Hardy, with an glxgears
running on a Gutsy (I don't have access to two Hardy machines). It
doesn't crash, but it works with a frame every few seconds. Would this
be a bug, or is this expected behavior? (It pretty much means OpenGL
isn't usable at all on a remote X).

$ ssh -X zalmox.lan glxgears
libGL error: open DRM failed (Operation not permitted)
libGL error: reverting to (slow) indirect rendering

For the record, "ssh -X localhost glxgears" works, but I don't know if
it actually uses a "remote" connection to communicate to the local X
server. (It does leave "ghosts" of the window on the desktop when it
moves, though.)

-- 
opengl over remote X (over ssh) crashes X
https://bugs.launchpad.net/bugs/83339
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