Frank, I tried to change this file /etc/modprobe.d/radeon-kms.conf on my laptop, and the problem of colored lines disappeared, but the resolution was reduced to 1024x768 (4:3), and the screen is not in decent shape, and the images are a bit fuzzy. The real resloución machine is 1280x800 (16:10), and that is when the screen resolution looks better. I had to return to change the file to achieve this resolution, and when I change resolution the lines appear again. Sorry for the translation, my English still is not very good, and use google translator. Greetings .- Dario Egea 2010/8/21 frank lovegrove