It depends on the way you are connecting the plasma to your laptop. If you are running it via dvi you are going to configure the laptop to show a secondary display and set your machine to output the resolution at a standard tv resolution, ie 1080i ( 1920x1080) or 720p (1280x720). Most older video cards do not naively support these resolutions, but often times you can get 3rd party drivers or find tweaks out there to unlock "secret" settings in your video card. One distro I have used a lot is omega, they have a lot of driver sets out there for all types. The only drawback is some versions have weird crashy bugs, so bear that in mind.