First off - you have made assumptions about your ROM, and your GPU, that are wrong off the bat... one being that it has an IR3567B handling core voltage. Also, saying you tried the "vddci mod"... means you don't know how this shit works. Okay, pretending your first assumption was correct for the sake of teaching, 0x8D would offset the first loop of the VRM controller, while 0x8E would offset the second. What those are connected to... you don't know (for now.) Now, 90% of the time, IR3567B controllers in Polaris cards have the first loop powering core, and nothing is on the second loop. The command 0x8E will, in this case, do fuck all. Now that you know a little more about the controller you are attempting to program, let's investigate your VoltageObjectInfo table to get a hint as to what may be wrong.


If the RegulatorID was 8... this would signal it was an IR3567B (can be wrong, but usually it errors by telling you there IS an IR3567B when there's not, not the other way round.) I know exactly which controller this is, and it's not remotely related. Conclusion is: you're sending I2C commands for an IR3567B to another controller, which can result in undefined behavior. Best case (and usual case) is that your erroneous commands/data will be ignored.