Does the display work with linux PC? Some hardware is less fussy about EDID. The vendor may be able to provide the EDID data.
You can supply EDID data via the kernel command line.
Sorry for late reply.Yes!It worked with linux pc specifically with fedora silverblue.
So we finally narrowed down to the rasp or arm specific!nice.
what do I need to supply it?
i see,xrandr - How to get EDID for a single monitor? - Unix & Linux Stack Exchange
seems to hint that its possible to get the EDID of a display.but I have no idea what to do with the EDID to make it work.