Comment 114 for bug 1778011

@Krzysztof: The NVIDIA GPU is more powerful, but also more power hungry than the Intel GPU. This is why you are seeing such a high power consumption.

If you select the Intel GPU, through prime-select, then you will lose the HDMI, but power consumption should also go down. If it doesn't, it is a bug, and I am going to provide a solution in the future.

As for losing the HDMI output even when both Intel and NVIDIA are enabled, that is certainly unexpected.