Ubuntu Jaunty on the Lenovo x200
I decided to install Ubuntu Jaunty Alpha 6, and have been using it since then. There does not seem to be any issues with it when used with the Lenovo x200 (the issues I have had have all been related to the fact that I chose amd64 as the platform – that creates some minor issues with browser plugins and such).
As the new Ubuntu uses a new Intel driver, using the DisplayPort interface in the docking station works flawlessly. Also, plugging in a Huawei 169 3G modem worked out of the box (it may have already done so in Ubuntu Intrepid Ibex, I did not test it). During installation, I chose to have my home drive automatically encrypted, and this has not created any issues either. All in all, (almost) everything is supported and working out of the box with the x200.
The only thing which does not seem to work with the x200 (of the features I have tested) is the middle mouse button, which just does not have scrolling enabled. But as I got it working in Intrepid Ibex, it should not be hard to do the same in Jaunty.