intel driver

[Luca Romagnoli]

Hi,
i have a motherboard mounting an intel G33. I using intel driver 2.2.1 
on ubuntu 8.04 and i have a problem with opengl procedural texture.

this is the scenario: i have 2 windows, one is an opengl window and the 
other is a generic window(for instance a terminal window).
during the pipe line i render and i store the result in a procedural 
texture, so i'll use this texture to the final render.

the problem is:
if the generic window is over the portion of the opengl window that i 
use to render the procedural texture so the result will be wrong.
it'seams the render is locked on the part of the opengl window 
overlapped by the other window, so the procedural texture never change. 
is it possible?

note if i lunch the same application on a pc (ubuntu 8.04) with a nvdia 
the problem don't happen.
have you got some idea?
thank for your help
Luca