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How to remove horizontal scanning lines when computer is connected to an LCD tv? Answered

Connected an older Audiovox LCD TV onto a desktop computer running Ubuntu. The computer ran well enough displaying to a normal LCD monitor, but once connected to the TV, there is a constant pattern of translucent lines running across the screen that scan up from the bottom. I've tried adjusting the "Clock" and the "Phase" of the TV to no avail, and ubuntu doesn't seem to have any refresh rate adjustments available other than 60Hz... so yeah. Need help here, trying to make an XBMC/linux file server/ media center...and a media center with a bad display just isn't right.