I read elsewhere on HN the other day that a PSCI API extension patch is awaiting upstream review to be merged into the Linux kernel and that power management would work better with that merged. May be an usable Asahilinux on M* MacBooks are not that far off..

Sounds more like it would be lower priority than very difficult?

It's not a single, difficult feature.

It's a system wide tuning of voltage frequency plus idle times for all sorts of micro-controllers, plus who knows what else.

In its own way, it's extremely, extremely difficult.

Yes, I’m aware. I’m just putting it in the context of the rest of the project.

True true, fair enough.