External display on HDMI overheating my Mac and drains the battery badly

Hey guys.

I am using a MBP retina 2012 15 inches with an external monitor, a generic LCD 1080 p via HDMI without problems. And recently updated for Sierra.

The question starts immediately when I plug it into the screen. The Macbook seems to overheat and run fans above 4000 rpm, which is very audible and boring. CPU and GPU temperatures go above 70 degrees C (normally they make 50 +). The battery holds for only 1.5 hours, generally works well for 4-5 hours.
I tried killing all apps, followed a bad process in activity monitor, changing default resolution - nothing helps so far. The CPU is barely used by 10%, the memory pressure is fine.
It's just that time when I plug the screen - Mac starts bad feeling. Never, the problem occurred on El Capitan. Maybe it's a GPU problem, but certainly caused by the OS.
All the world had the same problem?

Try resetting the NVRAM (hold down the command-option-P-R on startup).

Also, try to restart in Mode without failure, then normally again.

Finally, try logging into your account, sign in to a user account (or the guest account) and connect the external display. Same problem? If it works fine for a new account then it's something in your own account which is the cause - perhaps an element of connection or some other system changes induced by the operating system previous and who does not play nice with Sierra.

Tags: Mac OS & System Software

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