gtf - Man Page

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).

See Also

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 <>.

Referenced By

cvt(1), sway-output(5), xorg.conf(5).

xorg-server 1.20.14 X Version 11