This is a modified CVT modeline calculator based on cvt
by erich@uruk.org, which is based on GTF modeline calculator by Andy Ritger.

This modified version adds support for CVT v1.2 (VESA-2013-3 v1.2).

Changes:

Add support for CVT v1.2 reduced blanking timings.
Add support for 1000/1001 reducing of refresh rate for better movie support (ie 24hz * 1000 / 1001 = 23.976hz).
Add check for reduce blanking on CVT v1.1 for refresh rates not a multiple of 60hz.
Add checks for bad x y and refresh values.
Display 3 digits after decimal point on CLI output for the commented out part of the xf86 modeline. (ie 23.98hz -> 23.976hz)
Change xf86 modeline printout to be similar to x.org's cvt.
Fix some default timing values on v1.1 to be in line with the Vesa Public Standards CVT Generator.
Various minor changes.