[Bug 193710] New: vt(4) outdated information

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193710

            Bug ID: 193710
           Summary: vt(4) outdated information
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: Documentation
          Assignee: freebsd-doc at FreeBSD.org
          Reporter: emaste at freebsd.org

|     kern.vt.spclkeys
|             bitmap of allowed special keys. 1 is enabled, 0 is disabled.
|             Encoded as:
|             0x0001    Debug request key combination. (Ctrl+Alt+Esc)
|             0x0002    Reboot. (Ctrl+Alt+Del)
|             0x0004    Halt.
|             0x0008    Power down.
|             Default is 15, all enabled.

The "spclkeys" sysctl is no longer, replaced with per-key sysctls.

|     kern.vty
|             When both vt and sc(4) have been compiled into the kernel, the
|             one to use for the system console can be selected by setting this
|             value to ‘vt’ or ‘sc’.  If this value is not set, sc(4) is used.

The last sentence is true only if not booting via UEFI on amd64.  The situation
is now:

If this value is not set and the system is not booted via UEFI, sc(4) is used.  
For the UEFI boot case vt(4) is used.

syscons.4 may need a similar update.

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