Public bug reported:

When an X session is started for a second user, hardware OpenGL graphics
acceleration is disabled for that user. The difference in performance is
very obvious when using e.g. glxgears of planet penguin racer. This
problem has occurred using both gdm and kdm. I can't swear that it
happens every time, but I can't remember it not happening.

Perhaps a configuration file only allows acceleration on display 0 but
not on display 1?

I'm using feisty.

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

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graphics acceleration is disabled on second X session
https://bugs.launchpad.net/bugs/121264
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