What application is recommended to find dead pixels on LCD panel?

I suspect there are few of hot pixels on my panel. As it is still under warranty and by the rules of my vendor I can replace a machine if panel has a 3 dead pixels on it, I'd like to check how many dead pixels there actually are. In Windows, there are plenty of simple applications that just fill the whole screen with different colors so hot/dead pixels are easily visible. Does something like this exists for Ubuntu?

open terminal and install:

sudo apt-get install screentest

then:

screentest

right click on the screen to access the options for different test colors and patterns

This page just provides the white / black / red / green / blue screens to test your monitor: http://lcdtech.info/en/tests/dead.pixel.htm