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First of all, the specs:

  • MacBook Pro (17-inch, Early 2011)
  • OS X 10.12.6 (Sierra)
  • 2.2 GHz Intel Core i7
  • 16 GB RAM

I use this laptop in permanent clamshell mode, as though it were a desktop, with many externals, via powered USB hubs, etc.

The Problem:

About a year ago, my battery health fell below a point where SpeedStep was triggered, even when plugged in, and the CPU was generally crippled to 800Mhz.

In my laziness, I continued to use the computer in this fashion for about a year. (You can still do a lot with quad-core 800Mhz.)

I finally installed a healthy battery. However, the CPU is still operating at SpeedStep speeds. I've rebooted a couple of times; the 2.2Ghz processor is still running at 800Mhz.

It seems that my CPU is "stuck" on SpeedStep setting (even though the power is healthy and adequate). How can I resume normal speeds?

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