---
name: "gtf"
section: "1"
platform: "linux"
package: "xorg-server"
version: "21.1.25-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gtf"
---

# gtf(1)

calculate VESA GTF mode lines

## 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)](/xorg.conf/5.md)** file, and mode parameters suitable for the Linux **[fbset(8)](/fbset/8.md)** 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)](/fbset/8.md)**.

## SEE ALSO

[xorg.conf(5)](/xorg.conf/5.md), [cvt(1)](/cvt/1.md)

## 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\>.