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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> &#x2014; <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>
- &lt;<a class="Mt" href="mailto:nwhitehorn@FreeBSD.org">nwhitehorn@FreeBSD.org</a>&gt;.</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>