Comment 54 for bug 433142

Hi Frank,
The cvt is a linux utility for calculating VESA Coordinated Video Timing modes, given the desired horizontal, vertical resolutions and refresh rate. Gtf is a similar unix utility that basically does the same thing. I have seen other display timing generating utilities including one developed by one of our engineers called "lx_gtf.exe", which is distributed with our LX product on our AMD embedded developers website.
All these display timing generating utilities seem to give a slightly different horizontal timing, vertical timing or refresh rate, but they are all with in range and for the most part work well. By looking at display panel timing specs you can see that panels a range of tolerable timings, as long as you stay within the specified range the display works good. If you go ousstide their specified range you can see side effects including artifacts on the display screen, the screen shifted to the right to the left, up or down, or part of the display off the screen.
So, cvt and gtf are similar utilities that generate display timings.

Rigo