I have tested it on my current Maverick version (I have installed all the 
updates), using the latest kernel:
 2.6.35-23-generic #41-Ubuntu SMP Wed Nov 24 10:18:49 UTC 2010 i686 GNU/Linux

and the latest intel drivers from this ppa:glasen/intel-driver

I have exactly the same issues (glxgears is really jerky until I move
the mouse, or simply run glxgears in fullscreen window. Basically,
giving more work to the CPU seems to fix the issue). However if I add
'nohz=off' to grub parameters, glxgears is smooth again.

See this thread https://bugs.freedesktop.org/show_bug.cgi?id=30364, this
is exactly the issue I am having.

I am thinking about trying natty today on a USB stick and see if I have
the same issue.

Eric

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https://bugs.launchpad.net/bugs/665117

Title:
  glxgears really jerky on Maverick 

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