977      iPhone_iPad_Mac_apple

External display over HDMI overheats my Mac and...

Hey guys.

I've been using a 15-inch MBP Retina 2012 with an external display, a generic 1080p LCD via HDMI, without problems. And recently upgraded to Sierra.

The issue immediately starts when I'm plugging in the display. The Macbook seems to overheat and runs its fans above 4000rpm, which is very audible and annoying. The CPU and GPU temperatures go above 70 degrees C (normally they do 50+). The battery holds for only 1.5 hours, usually working fine for 4-5 hours.
I tried killing all apps, tracking a bad proccess in Activity Monitor, switching to default resolution — nothing helps so far. The CPU is barely used by 10%, the memory pressure is fine.
It's just that moment when I plug the monitor — the Mac starts feeling bad. The problem never occured on El Capitan. Maybe it's some GPU problem, but definitely OS-caused.
Has anybody had the same issue?

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

Also, try restarting in Safe Mode and then normally again.

Finally, try logging out of your normal account, log in to a new user account (or the guest account), and connect the external display. Same problem? If it works fine for a new account then it is something in your own account that is causing it - possibly a login item or some other system modification carried over from the previous OS and that is not playing nice with Sierra.

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

Also, try restarting in Safe Mode and then normally again.

Finally, try logging out of your normal account, log in to a new user account (or the guest account), and connect the external display. Same problem? If it works fine for a new account then it is something in your own account that is causing it - possibly a login item or some other system modification carried over from the previous OS and that is not playing nice with Sierra.

Hey, Luis! Thanks a ton for your suggestion.
I did the first two steps (NVRAM reset and safe mode) and it seems to work fine so far.

Thank you!

Hi Luis, done that, still having same issues and it's getting worse to the point I can't use external display at all! Every 10 minutes need to disconnect to let my MacBook cool down.

Do you mean it is too hot to touch?

I suppose the fans must running full blast then, right?

Have a look at Activity Monitor and see if there are applications using too much energy.

Did you try running the system in another user account for a while, with the external display? Does it still overheat in another user?

Does it also overheat if started in Safe Mode?

Yes, the fan is running full blast.

Nothing in activity monitor, everything normal.

The problem only appears when connecting external display via HDMI. Did run under another account, in safe mode and everything in between - no luck, it gets to the point where the system is unusable.

Did you reset the SMC? Reset the System Management Controller (SMC) on your Mac - Apple ...

Here is another thought: try with another HDMI cable.

Hi, Luis.
Unfortunately, I have to confirm that my problem still persists.

I have now tried all suggestions, including SCM reset, different HDMI cable, and also a different monitor.
Seems something's wrong with HDMI handling in Sierra.

Sorry to see that this has not been resolved.

I can only suggest that you give feedback to Apple, detailing all the steps you took in trying to solve it.

If it is a bug, I hope they fix it soon. It does not seem to be widespread, so it may be harder to pinpoint.

Anyway, they have to know about it: https://www.apple.com/feedback

I have replaced HDMI cable and the problem went away! Hope this helps.

Have you tried changing the display settings for the external monitor? I changed it to display instead of the monitors and my mac stopped overheating and works fine now

最后更新：2017-09-13 13:19:29

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