https://bugs.freedesktop.org/show_bug.cgi?id=110347
--- Comment #1 from bednarczyk.pawel@outlook.com --- I am able to work around the voltage issue by setting P6 frequency = P7 Frequency. In this case the voltage sits at the pre-defined value of 950mV, but I run into another problem. Memory Pstate is stuck at 0 (167 MHZ) so the overall performance goes down significantly. It seems there's an issue when the card goes into P7 with respect to voltages.