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+.\" $OpenBSD: led.4,v 1.4 2018/01/12 04:36:44 deraadt Exp $
+.\"
+.\" Copyright (c) 2007 Mark Kettenis <kettenis@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: January 12 2018 $
+.Dt LED 4 sparc64
+.Os
+.Sh NAME
+.Nm led
+.Nd SPARC64 LED driver
+.Sh SYNOPSIS
+.Cd "led* at ebus?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the front panel alert LED.
+This LED can be made to blink based on the load average on most systems
+by setting the
+.Xr sysctl 2
+variable
+.Ar machdep.led_blink
+to a non-zero value.
+.Sh SEE ALSO
+.Xr sysctl 2 ,
+.Xr ebus 4 ,
+.Xr intro 4 ,
+.Xr sysctl 8
+.Sh HISTORY
+.Ox
+support for the
+.Nm
+first appeared in
+.Ox 4.2 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Mark Kettenis Aq Mt kettenis@openbsd.org .