I own a Sony Vaio SZ notebook, which includes both an integrated Intel 945 graphics chipset as well as a GeForce 7400 chipset (which can be switched when the computer is turned off in order to choose between better battery life or better performance).
I have Ubuntu 7.04 installed, which was originally installed when I was using the Intel chipset. When later I switched to the Nvidia chipset, X crashed upon start. I then installed the Nvidia driver manually using the command line, and X started perfectly running at top performance.
The problem is that I am now unable to revert back to Intel when I want battery life. So I want to know if there is a simple way of switching between these devices easily, or, better yet, have Ubuntu automatically detect which graphics device is reconfire X accordingly upon boot? Under Windows Vista (preloaded with the notebook), this works wonderfully.