I find this problem is related to DGA.

How to test:

1.Start nexuiz with glx (nexuiz-linux-glx.sh)
2.Go to setting->input
3.Check "Turn off OS mouse acceleration" (tip -> "Make use of DGA mouse input")

than it should behave like nexuiz-linux-sdl.

I think SDL is using DGA for mouse input & this is the problem.

-- 
Mouse jumps to center in (sdl?/opengl?) games
https://bugs.launchpad.net/bugs/61105
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