acpiconf(8) and s5 (sleep type 5)

[Graham Perrin]

% sysctl hw.acpi.supported_sleep_state
hw.acpi.supported_sleep_state: S3 S4 S5
% sudo acpiconf -s5
acpiconf: invalid sleep type (5)
%

This is consistent with the absence of s5 from the manual page for 
acpiconf(8), however I wonder why – historically – mode/state/type 5 is 
invalid in this context.

I'm aware of equivalents e.g. `shutdown -p now`, just curious about the 
acpiconf(8) context.

<https://www.freebsd.org/cgi/man.cgi?query=acpi&sektion=4&apropos=0&manpath=FreeBSD+13.0-RELEASE#SYSCTL_VARIABLES>

<https://www.freebsd.org/cgi/man.cgi?query=acpiconf&sektion=8&manpath=FreeBSD+13.0-RELEASE>