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+<table class="head">
+  <tr>
+    <td class="head-ltitle">ASMC(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">ASMC(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">asmc</code> &#x2014; <span class="Nd">device
+    driver for the Apple System Management Controller (SMC)</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 line
+    in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device asmc</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+    the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>asmc_load=&quot;YES&quot;</pre>
+</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">asmc</code> driver controls the Apple System
+    Management Controller (SMC for short) found on Intel Apple systems.</p>
+<p class="Pp">The SMC is known to be found on the following systems:</p>
+<p class="Pp"></p>
+<ul class="Bl-bullet Bd-indent Bl-compact">
+  <li>MacBook</li>
+  <li>MacBook Pro</li>
+  <li>Intel MacMini</li>
+  <li>Mac Pro</li>
+  <li>MacBook Air</li>
+  <li>Intel iMac</li>
+</ul>
+<p class="Pp">With this driver, you can configure your keyboard backlight
+    brightness, check temperatures of several sensors, check the speed of the
+    internal fans and check the status of the Sudden Motion Sensor.</p>
+<p class="Pp">Variables related to the SMC control and inspection are exported
+    via <a class="Xr">sysctl(3)</a> under the device tree
+    <var class="Va">dev.asmc</var>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="KEYBOARD_BACKLIGHT"><a class="permalink" href="#KEYBOARD_BACKLIGHT">KEYBOARD
+  BACKLIGHT</a></h1>
+<p class="Pp">On MacBook Pro systems, you can control the keyboard brightness by
+    writing a value to the <var class="Va">dev.asmc.%d.light.control</var>
+    sysctl MIB or with <a class="Xr">backlight(8)</a> utility.</p>
+<p class="Pp">The following sysctl MIBs contains the raw value returned by the
+    left and right light sensors: <var class="Va">dev.asmc.%d.light.left</var>
+    or <var class="Va">dev.asmc.%d.light.right</var>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="TEMPERATURES"><a class="permalink" href="#TEMPERATURES">TEMPERATURES</a></h1>
+<p class="Pp">The number of temperature sensors and their description varies
+    among systems. You can inspect the temperature sensors on your system by
+    traversing the <var class="Va">dev.asmc.temp</var> sysctl MIB.</p>
+<p class="Pp">All values are in degrees celsius.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYSTEM_FANS"><a class="permalink" href="#SYSTEM_FANS">SYSTEM
+  FANS</a></h1>
+<p class="Pp">The <var class="Va">dev.asmc.fan.%d</var> sysctl tree contains the
+    leaf nodes <var class="Va">speed</var>, <var class="Va">safespeed</var>,
+    <var class="Va">minspeed</var>, <var class="Va">maxspeed</var> and
+    <var class="Va">targetspeed</var>. Each of these leaf nodes represent the
+    current fan speed, the safest minimum fan speed, the minimum speed and the
+    maximum speed respectively.</p>
+<p class="Pp">All values are in RPM.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="RAW_SMC_KEY_ACCESS"><a class="permalink" href="#RAW_SMC_KEY_ACCESS">RAW
+  SMC KEY ACCESS</a></h1>
+<p class="Pp">When the kernel is compiled with the
+    <code class="Dv">ASMC_DEBUG</code> option, a set of sysctl nodes is provided
+    under <var class="Va">dev.asmc.%d.raw</var> for reading and writing
+    arbitrary SMC keys by name.</p>
+<p class="Pp"></p>
+<dl class="Bl-tag Bl-compact">
+  <dt id="dev.asmc._d.raw.key"><var class="Va">dev.asmc.%d.raw.key</var></dt>
+  <dd>Set the 4-character SMC key name to access (e.g., &#x201C;AUPO&#x201D;).
+      Setting this automatically queries the key's length and type.</dd>
+  <dt id="dev.asmc._d.raw.value"><var class="Va">dev.asmc.%d.raw.value</var></dt>
+  <dd>Read or write the key's value as a hex string.</dd>
+  <dt id="dev.asmc._d.raw.len"><var class="Va">dev.asmc.%d.raw.len</var></dt>
+  <dd>The auto-detected value length in bytes (read-only).</dd>
+  <dt id="dev.asmc._d.raw.type"><var class="Va">dev.asmc.%d.raw.type</var></dt>
+  <dd>The 4-character SMC type string (e.g., &#x201C;ui8&#x201D;,
+      &#x201C;flt&#x201D;) (read-only).</dd>
+</dl>
+<p class="Pp">Example usage:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>sysctl dev.asmc.0.raw.key=AUPO
+sysctl dev.asmc.0.raw.value
+sysctl dev.asmc.0.raw.value=01</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SUDDEN_MOTION_SENSOR"><a class="permalink" href="#SUDDEN_MOTION_SENSOR">SUDDEN
+  MOTION SENSOR</a></h1>
+<p class="Pp">The Sudden Motion Sensor (SMS for short) is a device that detects
+    laptop movement and notifies the operating system via an interrupt. The
+    sysctl MIBs present under <var class="Va">dev.asmc.sms</var> all relate to
+    the SMS.</p>
+<p class="Pp">The most interesting usage of this device is to park the disk
+    heads when the laptop is moved harshly. First, you need to install
+    <a class="Xr">ataidle(8)</a>
+    (<span class="Pa">ports/sysutils/ataidle</span>) and then configure
+    <a class="Xr">devd(8)</a> the following way:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>notify 0 {
+	match &quot;system&quot;		&quot;ACPI&quot;;
+	match &quot;subsystem&quot;	&quot;asmc&quot;;
+	action			&quot;/usr/local/sbin/ataidle -s X Y&quot;;
+};</pre>
+</div>
+<p class="Pp">Do not forget to change the <var class="Ar">X</var> and
+    <var class="Ar">Y</var> values in the command above.</p>
+<p class="Pp">Also, please note that parking the disk heads too many times can
+    dramatically reduce your hard drive's life span. Do not rely solely on the
+    SMS to protect your hard drive: good care and common sense can increase your
+    hard drive's life.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
+<dl class="Bl-tag Bl-compact">
+  <dt><span class="Pa">/dev/backlight/asmc0</span></dt>
+  <dd>Keyboard <a class="Xr">backlight(8)</a> device node.</dd>
+</dl>
+</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">ataidle(8)</a>
+    (<span class="Pa">ports/sysutils/ataidle</span>),
+    <a class="Xr">backlight(8)</a>, <a class="Xr">devd(8)</a>,
+    <a class="Xr">sysctl(8)</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">asmc</code> driver first 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"><span class="An">Rui Paulo</span>
+    &lt;<a class="Mt" href="mailto:rpaulo@FreeBSD.org">rpaulo@FreeBSD.org</a>&gt;
+    (Google Summer of Code project)</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">Support for the latest models was never tested and is most likely
+    not fully working.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">March 29, 2026</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>