I have researched a little bit this problem and it is not a permission bug. It 
only seems to be that.
The problem is the direct rendering. 
if you disable direct rendering you can run 3D games without stripes (export 
LIBGL_ALWAYS_INDIRECT=true)
It is not a  permission problem because if you run with sudo direct rendering 
is automatically disabled (I don't known why) and that is the reason why it 
works with sudo. But if you run the game with the root user the problem is the 
same (because with root user direct rendering is enabled, like with your usual 
account) So it couldn't be a permission problem
With the drivers downloaded from amd's page this problem is not present (you 
can run 3D games with or without direct rendering with the same results, I mean 
without stripes)

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ubuntu 8.10, ATI X1250, compiz off - 3D games in full screen show coloured 
stripes
https://bugs.launchpad.net/bugs/292858
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