input: [1] generate_exact [2] 
output: Creates automatically some new modelines using the format specified on the `device_video_format' option. The generated modelines will be named `generate-*'. Check the `advdef.txt' file for the description of the `device_video_format' option or simply use the `advcfg' utility to set it up correctly. If the `device_video_format' option isn't specified a default value for your monitor clock limits is guessed.