GTF(1) General Commands Manual GTF(1)

gtf - calculate VESA GTF mode lines

gtf h-resolution v-resolution refresh [-v|--verbose] [-f|--fbmode] [-x|--xorgmode]

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.

Enable verbose printouts This shows a trace for each step of the computation.
Print the mode parameters as Xorg-style mode lines. This is the default format.
Print the mode parameters in a format suitable for fbset(8).

xorg.conf(5), cvt(1)

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 <>.

xorg-server 21.1.1 X Version 11