[Jacques]

I run my Octane2, equipped with a V12 at 1280x1024! That's because I don't have a screen which supports 1920x1200! (It's ridiculous that it can output this resolution through a 13W3, but not 1920x1080!!!??? I will need to get a DCD for this machine in the future, because it's the only way it will be able to output 1920x1080!)

You should be able to build a vfo for 1920x1080 for V12. 

First try the first link, otherwise have a read of the second and third ones and give it a go. Graham Loveridge put together a very good spreadsheet for calculating the VESA timing values. 

1920x1080 precompiled vfo file
https://www.dropbox.com/s/qcgvmp8xr3orgt...p.vfo?dl=0

Michalis Pastras very good VFO compilation guide
https://www.dropbox.com/s/z7dsyfl0wcjf7q...x.pdf?dl=0

Graham Loveridge's VESA timings Excel spreadsheet
https://www.dropbox.com/s/nu5bki5uzfn7px...g.xls?dl=0

Have fun.