Actually, I'm not quite sure when the "DRI" option is taken into account and 
when it's not. On my computer (965GM) it is not ignored, Xorg.0.log says 
(**) intel(0): Option "DRI" "off"
but glxinfo says 
direct rendering: Yes
and yet my OpenGL screensaver (Busy Spheres) is down to about 1 fps as opposed 
to something reasonable without the option, so something must have been turned 
off. The comment # 6 I referred to in the previous comment was in bug 447892 
and not this one. In that case the DRI option is clearly ignored. Maybe it 
depends on the chipset. It would therefore be nice to have your Xorg.0.log with 
KMS (i.e. no kernel option) and Option "DRI" "off" in xorg.conf in addition to 
the ones mentioned in the previous comment.

-- 
[i855] Karmic / i855GM / Fujistu Siemens Amilo M7400 :  Freeze shortly after X 
startup on Intel i855
https://bugs.launchpad.net/bugs/477972
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