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73416ba
(Get the code!)
I have this problem with my Radeon 9600XT
I had this problem on an install of Ubuntu Natty and so far the only thing I can confirm with repeatability is that 3D works when the S-video output is 'detected' and doesn't work when it isn't.
If I boot into Windows XP (dual boot) and enable the TV-Out on S-Video (even without a TV plugged in) and then reboot into Ubuntu Natty I get a 2nd screen on S-video showing up in the displays control panel and I get 3D acceleration to work.
I installed a test copy of Ubuntu Oneiric onto a USB HDD and so far haven't had issues with 3D.
HOWEVER: I recently did an upgrade to Oneiric inside the currently-installed Natty and the 3D issue is still present, so perhaps that is from something still there from the old installation?
Again, enabling S-video in Windows and rebooting is the only sure way to make 3D work.
Occasionally it will boot up and detect the S-video and enable 3D by itself but this is not often.