I few things to keep in mind before making requests to the CE Team. This is only possible on the s905x4 because it was originally released on kernel 4.9 (CE-NG) so there was official Amlogic support for this SOC, including a SC2 dovi.ko complied for kernel 4.9.
The s928x was never running on kernel 4.9, there’s no s928x 4.9 dovi.ko, and probably incomplete driver support for s928x on 4.9
AML NG pretty much ended with the s905x4. Something seems to have changed with amdolby in kernel 5.4 that broke FEL support and it’s likely going to be up to Amlogic to decide whether to fix it or not.
@anon62335196 I’m not sure about cm4 on the SC2 SOCs. Was it not ever working on the s922x? I never had a TV that supported cm4 to test that.