lcdtest man page

lcdtest — a utility to display LCD monitor test patterns


lcdtest [options]


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 monitors when using analog inputs, and for finding  pixels that are stuck on or off. lctest uses the SDL library


These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below.

-h, --help

get list of command keys.


list available video resolutions


display in a window rather than full screen.

-x <count>

use a video mode with the specified horizontal resolution

-y <count>

use a video mode with the specified vertical resolution


lcdtest was written by Eric Smith <>.

This manual page was written by Valerio Felici <>, for the Debian project (but may be used by others).


October 1, 2005