dont know if this have been posted before but i had some trouble getting Enemy Territory up and running on my laptop with Nvidia go card. I have searched forums and Google but can't really find anything that helped me so here's what i did:
I installed the Nvidia drivers after the "export IGNORE_CC_MISMATCH=true" syntax covered in many threads.
Then i installed ET, started it and got a black screen with no sound.
Tried glxinfo and found: direct rendering: No! And glxgears had only a black window.
Then after a massive Google search i found something that worked for me,
the Nvidia drivers don't remove/update(whatever) the libGL files in /usr/X11R6/lib/tls, and after a rename of those files i had direct rendering: Yes! and glxgears appeared visually
...and best of all: Enemy Territory runs !!
and so will probably also quake3 etc etc also.
maybe this will help others that have the same problem?