我的ACPI筆記

ACPI(Advanced Configuration and Power Interface)

• Types of ACPI Events

At the direct ACPI hardware level, two types of events can be signaled by an SCI interrupt:
• Fixed ACPI events:

ex:Power button signal, Sleep button signal 

• General-purpose events:

When OSPM receives a general-purpose event, it either passes control to an ACPI-aware driver, or uses an OEM-supplied control method to handle the event. An OEM can implement up to 128 general-purpose event inputs in hardware per GPE block, each as either a level or edge event. It is also possible to implement a single 256-pin block as long as it’s the only block defined in the system.  (指的是Qevent 00~FF嗎？！)

 ref：ACPI Spec 3.0b

• ACPI和其他的電源管理方式一樣，要想享受到上面這些功能，必須要有軟件和硬件的支援。硬件方面比較麻煩，除了要求主板、顯卡和網卡等外設要支援 ACPI外，還需要機箱電源的配合。電源在提供5伏電壓給主板的同時，還必須使電流穩定在720毫安以上才可以，這樣它才能夠實現電腦的「睡眠」和「喚醒」。

ref： 初心者之家 (ACPI VS APIC)

• (1) Button Devices
       • PNP0C0C — Power Button Device
       • PNP0C0D — Lid Device
       • PNP0C0E — Sleep Button Device
  (2) PCI Bus Wakeup Event Reporting (PME)
       • PNP0A03 — PCI Host Bridge