I think that it would be very handy if Knoppix included a pixel and/or screen checker.

For instance, you could boot Knoppix in a PC shop, and check a screen thoroughly before you buy it.

AFAIK there are two programs that do this:
Dead Pixel buddy: http://www.laptopshowcase.co.uk/downloads.php?id=1
Dead Pixel tester: http://www.dps.uk.com/freeware_DTP.htm

DPT has a linux icon, but i can't find a linux version. They both do not seem very complicated, and i think Wine can run them fine.

Does anyone know a better tool, or a native Linux tool?
A tool which checks not only pixels but also distortion etc would even be better.