## Physical Device Driver Reference

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### POWER_SETPOWEREVENTRES (41h) - EventMask

EventMask

A bit mask that defines the specific event messages permitted to be written into the caller's event queue. The following bits are defined for the EventMask field:

Bit # Meaning If Set
3 Enable Power Management
4 Disable Power Management
5 Restore BIOS Defaults
6 Set Power State
7 Battery Low Event
8 Normal Resume Event
9 Critical Resume Event All other bits are reserved and must be 0.

If any of the reserved bits in the EventMask field are set (value = 1), the request fails with a ReturnCode value of PowerBadReserved.