Matthew Garrett"Why does ACPI exist" in the beforetimes power management on x86 was done by jumping to an opaque BIOS entry point and hoping it would do the right thing. It frequently didn't. Failed to program your graphics card exactly the way the BIOS expected? Hurrah! Data corruption for you. ACPI made the reasonable decision that, well, maybe it should be up to the OS to set state and be able to recover it. But how should the OS deal with state that's fundamentally device specific?
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