.\"	$OpenBSD: xlights.4,v 1.3 2007/05/31 19:19:55 jmc Exp $
.\"
.\" Copyright (c) 2007 Gordon Willem Klok <gwk@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: May 31 2007 $
.Dt XLIGHTS 4 macppc
.Os
.Sh NAME
.Nm xlights
.Nd Xserve G4 and G5 front panel LEDs
.Sh SYNOPSIS
.Cd "xlights* at macobio?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the on-board i2s virtual sound device
that drives the front panel LEDs of Apple G4 and G5 Xserve machines.
.Pp
The lights provide an indication of system load and health.
System load is indicated by three dots travelling in a ring around the sixteen
LEDs found on the front panel.
When the system is lightly loaded these dots travel quickly and slow down
as system load increases.
System health is indicated by the absence of the dots which
means a hung machine or one that is in
.Xr ddb 4 .
.Sh SEE ALSO
.Xr intro 4 ,
.Xr macobio 4