2019 mbp loud fan when running on external monitor

Started 4 months ago | Discussions thread
mattspace Regular Member • Posts: 492
Re: 2019 mbp loud fan when running on external monitor

This is pretty much the normal reported behaviour with (discreet GPU) Macbooks that have external displays connected - It seems to effect AMD desktop GPUs as well - connecting a second monitor causes a BIG rise in power consumption and heat output.

Adaptors etc aren't going to change that. Plugging in the external display powers up the discreet GPU, which isn't normally used to drive the display on the internal screen - IIRC the actual display duty for the built in screen is handled by the iGPU in the CPU, until some 3D graphics, or computational acceleration is required.

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