https://marc.info/?l=linux-kernel&m=144838454925098&w=2 A bug was reported that on certain Broadwell platforms, after resuming from S3, the CPU is running at an anomalously low speed. It turns out that the BIOS has modified the value of the THERM_CONTROL register during S3, and changed it from 0 to 0x10, thus enabled clock modulation(bit4), but with undefined CPU Duty Cycle(bit1:3) - which causes the problem.
