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<table class="head">
<tr>
<td class="head-ltitle">SMU(4)</td>
<td class="head-vol">Device Drivers Manual (powerpc)</td>
<td class="head-rtitle">SMU(4)</td>
</tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<p class="Pp"><code class="Nm">smu</code> — <span class="Nd">Apple System
Management Unit Driver</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<p class="Pp">To compile this driver into the kernel, place the following lines
in your kernel configuration file:</p>
<div class="Bd Pp Bd-indent"><code class="Cd">device smu</code></div>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The <code class="Nm">smu</code> driver provides support for the
System Management Unit (SMU) found in many Apple G5 systems. This includes
most Power Macintosh G5 and all iMac G5 systems.</p>
<p class="Pp">The Apple SMU controller provides software power management and
thermal control functionality, and is responsible for managing system
cooling devices.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
<p class="Pp">Chips supported by the <code class="Nm">smu</code> driver
include:</p>
<p class="Pp"></p>
<ul class="Bl-bullet Bl-compact">
<li>Apple System Management Unit</li>
</ul>
</section>
<section class="Sh">
<h1 class="Sh" id="THERMAL_MANAGEMENT"><a class="permalink" href="#THERMAL_MANAGEMENT">THERMAL
MANAGEMENT</a></h1>
<p class="Pp">The <code class="Nm">smu</code> driver provides basic automatic
thermal management. Without a userspace daemon providing more advanced
control, the driver will attempt to maintain system temperatures in a
conservative range through coarse-grained control of system cooling devices
(see below). Automatic kernel-level thermal control will take over if more
than 3 seconds elapses between userspace cooling setting adjustments.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
VARIABLES</a></h1>
<p class="Pp">The <code class="Nm">smu</code> driver provides power management
services and thermal readout through a sysctl interface. The following
sysctls can be used to control the power management behavior and to examine
current system power and thermal conditions.</p>
<dl class="Bl-tag">
<dt id="dev.smu._d.server_mode"><var class="Va">dev.smu.%d.server_mode</var></dt>
<dd>Restart after power failure behavior (1 causes system to reboot after
power cut, 0 causes system to remain off).</dd>
<dt id="dev.smu._d.target_temp"><var class="Va">dev.smu.%d.target_temp</var></dt>
<dd>Target system temperature, in degrees Celsius. The
<code class="Nm">smu</code> driver will attempt to adjust fans to maintain
the temperature of the warmest component in the system at or below this
level.</dd>
<dt id="dev.smu._d.critical_temp"><var class="Va">dev.smu.%d.critical_temp</var></dt>
<dd>System critical temperature, in degrees Celsius. If any component in the
system exceeds this temperature, the machine will be shut down within 500
ms.</dd>
<dt id="dev.smu._d.fans._s.minrpm"><var class="Va">dev.smu.%d.fans.%s.minrpm</var></dt>
<dd>Minimum allowed speed for this fan.</dd>
<dt id="dev.smu._d.fans._s.maxrpm"><var class="Va">dev.smu.%d.fans.%s.maxrpm</var></dt>
<dd>Maximum allowed speed for this fan.</dd>
<dt id="dev.smu._d.fans._s.rpm"><var class="Va">dev.smu.%d.fans.%s.rpm</var></dt>
<dd>Current speed for this fan. The fan speed can be adjusted by changing this
sysctl. If more than 3 seconds elapses between fan speed adjustments, the
kernel will resume automatic control of the fan.</dd>
<dt id="dev.smu._d.sensors._s"><var class="Va">dev.smu.%d.sensors.%s</var></dt>
<dd>Current reading from this sensor. Four sensor types are supported.
Temperature sensors are in units of degrees Celsius, current sensors in
milliamps, voltage sensors in millivolts, and power sensors in
milliwatts.</dd>
</dl>
</section>
<section class="Sh">
<h1 class="Sh" id="LED_INTERFACE"><a class="permalink" href="#LED_INTERFACE">LED
INTERFACE</a></h1>
<p class="Pp">The <code class="Nm">smu</code> driver provides an
<a class="Xr">led(4)</a> annunciator interface at
<span class="Pa">/dev/led/sleepled</span>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<p class="Pp"><a class="Xr">acpi(4)</a>, <a class="Xr">led(4)</a>,
<a class="Xr">pmu(4)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<p class="Pp">The <code class="Nm">smu</code> device driver appeared in
<span class="Ux">FreeBSD 8.0</span>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
<p class="Pp">The <code class="Nm">smu</code> driver was written by
<span class="An">Nathan Whitehorn</span>
<<a class="Mt" href="mailto:nwhitehorn@FreeBSD.org">nwhitehorn@FreeBSD.org</a>>.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">February 22, 2010</td>
<td class="foot-os">FreeBSD 15.0</td>
</tr>
</table>
|
