cvt utility needs attention

I've been trying to create Linux version of custom 60->73 "reduced blanking" overclock modes for my TN and VA LCD 1080p@60fps monitors, similar to ones generated & injected under Windows® with "Custom Resolution Utility", but X's unmaintained cvt utility refused to do so. At least AMD's Windows® blob had a decency to generate those modes and then refuse to use them. I had to search for alternatives and there were 2:

https://github.com/kevinlekiller/cvt_modeline_calculator_12 - the one I actually used.
https://www.riscosports.co.uk/downloads.html - that seem to be generating decent modes also

Ideally, it would be nice to have some kind of runtime mode generator that can have GUI, such as being a part of xrandr or something. But replacing useless old cvt with a decent fork such as those would be useful as well. Other than overclocking custom mode generator was useful for creating actual recommended modes (1280x1024@89 & 1024x768@116) for my old beefy Samsung 757mb CRT but it works with old, non-reduced kind that gtf generates. But fancy modern dual-link DVI, HDMI ≥2.0 and DP ≥1.2 LCDs are ripe for fiddling with CVT modes, just look at what people do with CRU.

Edited Aug 06, 2019 by Adam Jackson

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