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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">ACPI_THERMAL(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">ACPI_THERMAL(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">acpi_thermal</code> &#x2014;
- <span class="Nd">ACPI thermal management subsystem</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">device acpi</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">acpi_thermal</code> driver provides the
- thermal management features of the ACPI module. This driver has a
- <a class="Xr">sysctl(8)</a> interface and a <a class="Xr">devd(8)</a>
- notification interface. The sysctls export properties of each ACPI thermal
- zone object.</p>
-<p class="Pp">There can be multiple thermal zones in a system. For example, each
- CPU and the enclosure could all be separate thermal zones, each with its own
- setpoints and cooling devices. Thermal zones are numbered sequentially in
- the order they appear in the AML.</p>
-<p class="Pp">The <code class="Nm">acpi_thermal</code> driver also activates the
- active cooling system according to each thermal zone's setpoints.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
- VARIABLES</a></h1>
-<dl class="Bl-tag">
- <dt id="hw.acpi.thermal.min_runtime"><var class="Va">hw.acpi.thermal.min_runtime</var></dt>
- <dd>Number of seconds to continue active cooling once started. A new active
- cooling level will not be selected until this interval expires.</dd>
- <dt id="hw.acpi.thermal.polling_rate"><var class="Va">hw.acpi.thermal.polling_rate</var></dt>
- <dd>Number of seconds between polling the current temperature.</dd>
- <dt id="hw.acpi.thermal.user_override"><var class="Va">hw.acpi.thermal.user_override</var></dt>
- <dd>If set to 1, allow user override of various setpoints (below). The
- original values for these settings are obtained from the BIOS and system
- overheating and possible damage could occur if changed. Default is 0 (no
- override).</dd>
- <dt id="hw.acpi.thermal.tz_d.active"><var class="Va">hw.acpi.thermal.tz%d.active</var></dt>
- <dd>Current active cooling system state. If this is non-negative, the
- appropriate _AC%d object is running. Set this value to the desired active
- cooling level to force the corresponding fan object to the appropriate
- level.</dd>
- <dt id="hw.acpi.thermal.tz_d.passive_cooling"><var class="Va">hw.acpi.thermal.tz%d.passive_cooling</var></dt>
- <dd>If set to 1, passive cooling is enabled. It does cooling without fans
- using <a class="Xr">cpufreq(4)</a> as the mechanism for controlling CPU
- speed. Default is enabled for tz0 where it is available.</dd>
- <dt id="hw.acpi.thermal.tz_d.thermal_flags"><var class="Va">hw.acpi.thermal.tz%d.thermal_flags</var></dt>
- <dd>Current thermal zone status. These are bit-masked values.</dd>
- <dt id="hw.acpi.thermal.tz_d.temperature"><var class="Va">hw.acpi.thermal.tz%d.temperature</var></dt>
- <dd>Current temperature for this zone.</dd>
- <dt id="hw.acpi.thermal.tz_d._PSV"><var class="Va">hw.acpi.thermal.tz%d._PSV</var></dt>
- <dd>Temperature to start passive cooling by throttling down CPU, etc. This
- value can be overridden by the user.</dd>
- <dt id="hw.acpi.thermal.tz_d._CR3"><var class="Va">hw.acpi.thermal.tz%d._CR3</var></dt>
- <dd>Temperature to start critical suspend to RAM (S3). This value can be
- overridden by the user.</dd>
- <dt id="hw.acpi.thermal.tz_d._HOT"><var class="Va">hw.acpi.thermal.tz%d._HOT</var></dt>
- <dd>Temperature to start critical suspend to disk (S4). This value can be
- overridden by the user.</dd>
- <dt id="hw.acpi.thermal.tz_d._CRT"><var class="Va">hw.acpi.thermal.tz%d._CRT</var></dt>
- <dd>Temperature to start critical shutdown (S5). This value can be overridden
- by the user.</dd>
- <dt id="hw.acpi.thermal.tz_d._ACx"><var class="Va">hw.acpi.thermal.tz%d._ACx</var></dt>
- <dd>Temperatures at which to switch to the corresponding active cooling level.
- The lower the _ACx value, the higher the cooling power.</dd>
-</dl>
-<p class="Pp">All temperatures are printed in Celsius. Values can be set in
- Celsius (by providing a trailing &quot;C&quot;) or Kelvin (by leaving off
- any trailing letter). When setting a value by <a class="Xr">sysctl(8)</a>,
- do not specify a trailing decimal (i.e., 90C instead of 90.0C).</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="NOTIFIES"><a class="permalink" href="#NOTIFIES">NOTIFIES</a></h1>
-<p class="Pp">Notifies are passed to userland via <a class="Xr">devd(8)</a>. See
- <span class="Pa">/etc/devd.conf</span> and <a class="Xr">devd.conf(5)</a>
- for examples. The <code class="Nm">acpi_thermal</code> driver sends events
- with the following attributes:</p>
-<p class="Pp"></p>
-<dl class="Bl-tag Bl-compact">
- <dt id="ACPI">system</dt>
- <dd><a class="permalink" href="#ACPI"><code class="Li">ACPI</code></a></dd>
- <dt id="Thermal">subsystem</dt>
- <dd><a class="permalink" href="#Thermal"><code class="Li">Thermal</code></a></dd>
- <dt>type</dt>
- <dd>The fully qualified thermal zone object path as in the ASL.</dd>
- <dt>notify</dt>
- <dd>An integer designating the event:
- <p class="Pp"></p>
- <dl class="Bl-tag Bl-compact">
- <dt id="0x80"><a class="permalink" href="#0x80"><code class="Li">0x80</code></a></dt>
- <dd>Current temperature has changed.</dd>
- <dt id="0x81"><a class="permalink" href="#0x81"><code class="Li">0x81</code></a></dt>
- <dd>One or more trip points (_ACx, _PSV) have changed.</dd>
- <dt id="0x82"><a class="permalink" href="#0x82"><code class="Li">0x82</code></a></dt>
- <dd>One or more device lists (_ALx, _PSL, _TZD) have changed.</dd>
- <dt id="0xcc"><a class="permalink" href="#0xcc"><code class="Li">0xcc</code></a></dt>
- <dd>Non-standard notify that the system will shutdown if the temperature
- stays above _CRT or _HOT for one more poll cycle.</dd>
- </dl>
- </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">acpi(4)</a>, <a class="Xr">cpufreq(4)</a>,
- <a class="Xr">acpidump(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp"><span class="An">Michael Smith</span></p>
-<p class="Pp">This manual page was written by <span class="An">Takanori
- Watanabe</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">November 21, 2022</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>