Re: Dual/Single Link TMDS
No, you cannot force dual link TMDS. Without seeing a detailed bug report, its not really possible to guess why the EDID isn't being seen consistently. It might be a hardware problem, or it might be a driver problem.
Both 1.0-8762 and 1.0-9631 are no longer supported, so I'd suggest updating to 100.14.11 and retesting.