My 6600GT is working with UI2 alpha-blending. I'm using the latest nVidia driver (9755). Follow the steps outlined by user k84 in this thread:http://forum.linuxmce.com/index.php?topic=1310.0
That will get you past the incorrect driver detection problem and LMCE will start using the nVidia driver. Depending on the TV/Monitor that you are connected to you may still have problems. In my case, the default 720p timings that LMCE uses weren't supported over DVI by my HDTV. The TV did report the correct EDID information back to the video card, but LMCE ignores it when generating the xorg.conf.pluto file. Some TV's are better than others about reporting the correct EDID information. To correct the problem I manually edited the /etc/X11/xorg.conf.pluto file. Under the "Monitor" section there will be any entry like this:
Option "IgnoreEDID" "true"
I changed it to false so that it actually uses the EDID info. That fixed my problem. The catch is that each time you start LMCE it will regenerate the xorg.conf.pluto file, so my changes were lost.
The work around is to add an "exit;" to the top of this file:
That essentially aborts the script that tries to reconfigure the display. So once you have a valid config it won't change it again.
Give that a try.