For some strange reason, a recent update to the latest ubuntu kernel disabled the ati driver on my thinkpad T400.
Just for the record. This is what I did to reinstall it:
First, go to:
Use the page to select your driver:
For Karmic 9.10 x64 and i386 it will be:
Ensure you are fully up to date with
$ sudo apt-get update
Ensure that you hvae the QT4 libraries with:
$ sudo apt-get install libqtgui4
Copy the downloaded file into it's own folder. From a terminal change to that folder and then create deb files with:
$ sudo sh ./ait-driver-installer-10-1-x86.x86_64.run --buildpkg Ubuntu/karmic
That will create the necessary "deb" files.
Lastly install these with:
$ sudo dpkg -i *.deb
After a reboot, I had to re-run the Compiz Manager to reset all my options.
You can check that it is all working using
My display showed the following:
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Mobility Radeon HD 3400 Series
OpenGL version string: 1.4 (2.1.9026)