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i7-5775c + Iris 6200 Pro IGP stuck at 300Mhz

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I'm running Mojave on a H97/5775c, recently upgraded the CPU from I3-4370. 

It looks like the Iris 6200 GPU is stuck at 0.3Ghz (the slowest possible).

Tried different system definitions (14,1 - 16,1 - 16,2 (this one fails instantly)), clover intel inject, whatevergreen, different adapter ids, removing PM states, disabling quirks, no luck - it stays at 0.3Ghz. 

How can I either fix GPU clock management or force it to use the "high" clockspeed by default?



Screenshot 2020-12-11 at 14.07.52.png

Screenshot 2020-12-11 at 14.07.24.png

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