Everytime i get a blank screen when i try this kernel parameter:
initrd=/edid.cpio drm_kms_helper.edid_firmware=edid/edid.bin video=card0-HDMI-A-1:3840x1080D
edid/edid.bin doesn't exist, so yeah, kernel gets confused. Note, loading custom edid is not really supported as of now in some LE images (including AW), because kernel tries to load file before filesystems are even mounted.