Power Management Update In Linux 4.3 Adds New Support, But Mostly Unexciting

[phoronix]

Phoronix: Power Management Update In Linux 4.3 Adds New Support, But Mostly Unexciting

Rafael Wysocki mailed in the power management and ACPI updates this evening for the Linux 4.3 kernel merge window...

http://www.phoronix.com/scan.php?page=news_item&px=Linux-4.3-ACPI-PM

[Adarion]

ACPI is basically a pest since MS had its fingers into it. Lately I even seem to have regressions, some buttons on a laptop stopped working with the .config just copied from 3.x to 4.x. A geode CPU won't even boot, it hangs, unless I submit a noacpi parameter to the kernel's boot command line. And it was perfectly fine before, that system even had good ACPI tables according to the iasl decompile recompile process.

[Azrael5]

What CPus are affected by this update?

[mlau]

What CPus are affected by this update?

x86, and arm64 is starting to get infected by acpi as well.

[Azrael5]

x86, and arm64 is starting to get infected by acpi as well.

infected by what exactly?

[Azrael5]

ACPI is basically a pest since MS had its fingers into it. Lately I even seem to have regressions, some buttons on a laptop stopped working with the .config just copied from 3.x to 4.x. A geode CPU won't even boot, it hangs, unless I submit a noacpi parameter to the kernel's boot command line. And it was perfectly fine before, that system even had good ACPI tables according to the iasl decompile recompile process.

You suggest to disable it in bios allowing APM only?

[mlau]

infected by what exactly?

the needless complexity of acpi of course.

[mlau]

You suggest to disable it in bios allowing APM only?

I don't think apm is implemented any more. acpi support is more or less mandatory for all recent (<=10 year old) x86 platforms.
on arm64 you have the choice of OF or ACPI; if you want to be able to run windows on your arm64 board, you need acpi in your board.
I should delete my comment about "infection"

[Azrael5]

I don't think apm is implemented any more. acpi support is more or less mandatory for all recent (<=10 year old) x86 platforms.
on arm64 you have the choice of OF or ACPI; if you want to be able to run windows on your arm64 board, you need acpi in your board.
I should delete my comment about "infection"

It's not important to delete it, it's important to understand. What I don't understand is the reason why ACPI generates problems on linux systems, what problems it generates and the hardware range of these problems. Eventually how these problems occur and how to detect them, so to feedback to developers eventually they want to cooperate to make better linux systems.