I assume that your TFT has the widescreen resolution of 1280x800. xrandr
output looks good. Does your TFT work hardy or with other operating
systems? If not it could be a hardware defect. Three years ago my TFT
had vertiacal red lines and it was a hardware fault.

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Funky blinking coloured lines horizontilly on the screen. Appears at log in and 
on the desktop.
https://bugs.launchpad.net/bugs/257392
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