eigentlich nur tables, wo infos über wo und wie hardware zufinden ist, drin steht
es gibt aber auch methoden
- ref: https://learn.microsoft.com/de-de/windows-hardware/drivers/pci/enabling-pci-express-native-control
- eg _OSC Operating system capabilities
  - acpi spec page 361
there are ACPI Events
- the EC = Embedded Controller triggers an SCI = System Control Interrupt, and the ACPI Driver in the OS gets the event
- i imagine power button press could be such an event

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