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CentOS 7.0 - man page for gtf (centos section 1)

GTF(1)							      General Commands Manual							    GTF(1)

NAME
gtf - calculate VESA GTF mode lines
SYNOPSIS
gtf h-resolution v-resolution refresh [-v|--verbose] [-f|--fbmode] [-x|--xorgmode]
DESCRIPTION
Gtf is a utility for calculating VESA GTF modes. Given the desired horizontal and vertical resolutions and refresh rate (in Hz), the parameters for a matching VESA GTF mode are printed out. Two output formats are supported: mode lines suitable for the Xorg xorg.conf(5) file, and mode parameters suitable for the Linux fbset(8) utility.
OPTIONS
-v|--verbose Enable verbose printouts This shows a trace for each step of the computation. -x|--xorgmode Print the mode parameters as Xorg-style mode lines. This is the default format. -f|--fbset Print the mode parameters in a format suitable for fbset(8).
SEE ALSO
xorg.conf(5), cvt(1)
AUTHOR
Andy Ritger. This program is based on the Generalized Timing Formula (GTF(TM)) Standard Version: 1.0, Revision: 1.0. The GTF Excel(TM) spreadsheet, a sample (and the definitive) implementation of the GTF Timing Standard is available at <ftp://ftp.vesa.org/pub/GTF/VTF_V1R1.xls>. X Version 11 xorg-server 1.15.0 GTF(1)