Package lcdtest

Displays monitor test patterns

http://www.brouhaha.com/~eric/software/lcdtest/

lcdtest is a utility to display LCD monitor test patterns. It may be
useful for adjusting the pixel clock frequency and phase on LCD
monitors when using analog inputs, and for finding pixels that are
stuck on or off.

General Commands (Section 1)
lcdtest
This manual page documents briefly the lcdtest command. lcdtest is a program that may be useful for adjusting the pixel clock frequency and phase on LCD...