I have a ThinkPad T420 with an NVidia Quadro video card. It crashes constantly when I close this lid (if you are curious..) and I suspect on a problem with nouveau drivers, so I installed the proprietary NVidia drivers.
Howeer, when I install and use this driver, Compiz does not work. If I start a session with uses Compiz, no window manager/decorator is presented. I just can get Metacity working. Does anyone has any idea about what may be causing this problem?
Edit: I am using the Nvidia Driver version 304.37. My video card is an Nvida Quadro NVS 4200M.
lspci informs me that there is another controller in my machine:
VGA compatible controller, Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller, which sounds strange to me (I actually do not understand a lot about hardware and would expect to have only one card in my notebook). My Ubuntu is 12.04.