I'm having an issue with the Indivision AGA MK3 where two of my monitors say the timing for the 1920x1080@60 resolution is out of range. One is a Dell U2312HM (1920x1080 native resolution) from 2011 and the other an HP Z27 (3840x2160 native resolution) that I got new this year. A Dell P2415Q from 2015 doesn't have the issue.
The super weird thing is that these are actually one of the monitors' EDID resolutions. They all report this in EDID, which also matches the 1920x1080@60 preset:
I checked the Z27's manual, and it says 1920x1080@60 should have a horizontal frequency of 67.5 kHz, so that's slightly different than these timings.
Could it be that the EDID data is changed from what the monitor reported at some point?
Also note that the above doesn't match any of the 1920x1080@60 timings from the Video Timings Calculator. I couldn't try the CVT timings because those require a pixel clock of 173 MHz, but I did try the CVT-RB timings and those also didn't work.
Strangely, both do monitors work with the exact same settings except a 125 MHz pixel clock so the vertical refresh rate becomes 50 Hz (to be more compatible with Amiga PAL modes).
I tried some stuff some weeks ago when I got the MK3 and don't remember seeing this issue on these monitors or my 4K TV. I think I tried 1920x1080@60 then but I can't be sure. Since then I've only been using the P2415Q monitor which doesn't have the issue, until today.
I tried restoring the August 24 firmware but that didn't change anything.