I'm working with an output device that normally takes in SDI inputs. I am using an HDMI to SDI converter, but it means that the EDID information reported over HDMI is inaccurate to the output device. If I attempt to boot with X11 auto-detecting everything, it doesn't work (blank screen with low-resolution signal).
If I boot with the HDMI plugged into a monitor that has the same max resolution and refresh rate as my target device, X11 sets up properly. If I then unplug the monitor and plug into the converter, the settings stay the same and it works. I copied the monitor's EDID to a file, and got the modeline for the working video mode. xorg.conf is set up to load the EDID from the file, add in the modeline, and select that mode. I have confirmed that this is all working by looking at Xorg.0.log. It looks like something is still missing though, as the behavior is exactly the same as before (device fails; monitor works; hotswap from monitor makes device work). Is there any other information I can add to xorg.conf to make the system think it's plugged into the working monitor during it's initial setup?
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