Flexview Screens - bibanon/Coreboot-ThinkPads GitHub Wiki
T43 Flexview on T60 Systems
The T60 uses EDID lockout chips to restrict the types of screens it is compatible with. Thus, if you are using a screen from an A31, T41, T42, or T43; you will need to hack the EDID to support it.
However, you can't hack an EDID if the screen has no such chip... Which only some T43 series do. You might be able to graft one on though, if you have the skills.