[Bug 205829] documenting disabling ctrl-alt-space suspend feature in acpi(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205829

--- Comment #4 from John Baldwin <jhb at FreeBSD.org> ---
It is certainly under-documented.  I think the newer vt(4) console (slated to
replace sc(4)) has a separate sysctl to enable/disable the suspend key.  For
syscons I think the only route you have to disable the suspend hotkey is to
load a custom keymap that doesn't include it. :(  (I think you would have to
generate such a keymap yourself unfortunately.)

Actually, even vt(4) doesn't have a separate knob for this key (it does have
sysctls for other special keys like panic/reboot/poweroff).  I think we should
add a knob for this special key to both vt(4) (kern.vt.kbd_suspend) and sc(4)
(hw.syscons.kbd_suspend).

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