[Bug 214370] acpi(4) reports outdated sysctls

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214370

            Bug ID: 214370
           Summary: acpi(4) reports outdated sysctls
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Documentation
          Assignee: freebsd-doc at FreeBSD.org
          Reporter: elferdo at gmail.com

On FreeBSD 11.0-RELEASE-p2 #0, consulting acpi(4) I see the following sysctl:

hw.acpi.cpu.cx_supported

However, on the shell:

% sysctl hw.acpi.cpu.cx_supported
sysctl: unknown oid 'hw.acpi.cpu.cx_supported'

Inspecting actual sysctls:

% sudo sysctl -a | grep cx
has_pipe_cxsr: no
hw.acpi.cpu.cx_lowest: C8
dev.cpu.3.cx_method: C1/mwait/hwc C2/mwait/hwc/bma C3/mwait/hwc/bma
dev.cpu.3.cx_usage_counters: 6920 1550 84854
dev.cpu.3.cx_usage: 7.41% 1.66% 90.92% last 49us
dev.cpu.3.cx_lowest: C8
dev.cpu.3.cx_supported: C1/1/3 C2/2/205 C3/3/245
[...]

It seems that cx_supported move from hw.acpi to dev, but acpi(4) failed to
reflect this fact.

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