I am afraid the fix does not work for all the machines. Before writing this, I 
posted a question, and MarcoBra eventually advised me to fill a new bug report 
or to post here -- I think a new bug report would not be appropriate.
see: https://answers.launchpad.net/ubuntu/+question/45103
Problem: on several occasions (e.g. if I type "glxinfo | grep direct"), I get 
the error message (or warning):
"Failed to initialize TTM buffer manager. Falling back to classic."
I never got it under Hardy. "Compiz.real" outputs several error messages and 
leaves the screen "stuck" -- I mean, the windows become unresponsive, and I get 
back only by choosing an option from System/Preferences/Appearance/Visual 
effects. Btw, no radio button is selected by default in that menu.
I have Intrepid alpha5, updated, upgraded and distro-upgraded on Sat Sep 13.
Details from lshw -C display, lspci and xconf.org are attached to question 
#45103.
Briefly, my gr. card is Intel 943GML.
The interesting thing is that I installed Fedora 9. As soon as the install was 
done, I type "glxinfo" in a Terminal and got the error "Failed to initialize 
TTM buffer manager. Falling back to classic." But I did a complete update and 
upgrade (which took several hours): after that, the error message _disappeared_.
[Fedora 9] uname -r
2.6.25.14-108.fc9.i686.
Therefore, I guess there is a real issue that has still to be solved in 
Intrepid.
One more detail that might be of some help for a (possible) debug. My display 
card is marked as "unclaimed". If I try to install a driver (via gksu 
displayconfig etc.) the only available driver is the i810 (which gives a lot of 
trouble: I ended by resetting the xorg.conf and keeping the unclaimed display). 
Fedora suggests another driver by default: that is, an "experimental driver for 
Intel integrated chipsets", which is explicitly tailored for the 943GML (as 
well as for other Intel integrated cards). My guess is that this driver, or a 
similar one, would improve the hardware compatibility between Intrepid and 
machines mounting the 943GML.
This might be a nice case of cooperation between distros :-)

-- 
Intrepid, on latest updates (mesa updates - 7.1~rc1-0ubuntu1), compiz no longer 
works and gives white screen on login
https://bugs.launchpad.net/bugs/245888
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