https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289634

            Bug ID: 289634
           Summary: ACPI(4) not managing power on 16.0-CURRENT
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

ACPI(4) on CURRENT now appears to be completely broken: the system cannot be
suspended, shut down, or rebooted, and ACPI-based power management is
unavailable.
Trying to suspend, shut down, or reboot the system leads to a panic; zzz(8) no
longer works:
# zzz
Error: no ACPI or APM suspend support found.

Reverting these commits helps to restore power management:

Revert "sys/power: Generic sleep types"
This reverts commit c43473dc9b8349103f78107300457ca35e437882.

Revert "acpi: Use sleep types defined in sys/power.h"
This reverts commit ce5e22b28ef6caff3ffd228ac188114b08c0da02.

Revert "sys/power: Sleep type reporting by PM backends"
This reverts commit e779891327b1d9b9ab10ba482e59f498790505a7.

Revert "acpi: Fix build when `ACPI_DEBUG_OUTPUT` defined"
This reverts commit 4894f5ba394306a75dbed9ed4377ab0eae75aede.

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