I have a Macbook Pro i9 max out and recently found an issue. When I connect the MBP on a 30" monitor through a HDMI cable, the battery draw significant amount of power and it lasts 1/3 of the regular battery life. Does anyone seen a similar behavior? How to fix this?
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Macbook Pro i9 battery issue
- Thread starter mjyu51
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There are two simple solutions
1) Plug in the power cable.
2) External GPU
The reason your battery life goes down so much, is that being plugged in to an external display forces the usage of the high-end GPU which of course draws a lot more power than only using the iGPU. This is because the internal display is physically wired to the iGPU, and when the dGPU is needed it sends its results to the framebuffer of the iGPU, but the outputs are physically wired to the dGPU to maximise performance.
At least that's how it used to be on older generations
