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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">ACPITZ(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">ACPITZ(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">acpitz</code> &#x2014; <span class="Nd">ACPI
- Thermal Zone</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">acpitz* at 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">acpitz</code> driver supports so-called ACPI
- &#x201C;Thermal Zones&#x201D;. The temperature can be monitored by the
- <a class="Xr">envsys(4)</a> API or the <a class="Xr">envstat(8)</a>
- command.</p>
-<p class="Pp">The distinction between &#x201C;active&#x201D; and
- &#x201C;passive&#x201D; cooling is central to the abstractions behind
- <code class="Nm">acpitz</code>. These are inversely related to each
- other:</p>
-<ol class="Bl-enum Bd-indent">
- <li>Active cooling means that the system increases the power consumption of
- the machine by performing active thermal management (for example, by
- turning on a fan) in order to reduce the temperatures.</li>
- <li>Passive cooling means that the system reduces the power consumption of
- devices at the cost of system performance (for example, by lowering the
- CPU frequencies) in order to reduce the temperatures.</li>
-</ol>
-<p class="Pp">Only active cooling is currently supported on
- <span class="Ux">NetBSD</span>.</p>
-<p class="Pp">It should be also noted that the internal functioning of these
- cooling policies vary across machines. On some machines the operating system
- may have little control over the thermal zones as the firmware manages the
- thermal control internally, whereas on other machines the policies may be
- exposed to the implementation at their full extent.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EVENTS"><a class="permalink" href="#EVENTS">EVENTS</a></h1>
-<p class="Pp">The <code class="Nm">acpitz</code> driver knows about the active
- cooling levels, the current temperatures, and critical, hot, and passive
- temperature thresholds (as supported by the hardware). The driver is able to
- send events to <a class="Xr">powerd(8)</a> when the sensor's state has
- changed. When a Thermal Zone is either critical or &#x201C;hot&#x201D;, the
- <span class="Pa">/etc/powerd/scripts/sensor_temperature</span> script will
- be invoked with a
- <a class="permalink" href="#critical-over"><i class="Em" id="critical-over">critical-over</i></a>
- event.</p>
-<p class="Pp">The critical temperature is the threshold for system shutdown.
- Depending on the hardware, the mainboard will take down the system instantly
- and no event will have a chance to be sent.</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">acpifan(4)</a>,
- <a class="Xr">envsys(4)</a>, <a class="Xr">envstat(8)</a>,
- <a class="Xr">powerd(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">acpitz</code> driver appeared in
- <span class="Ux">NetBSD 2.0</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">Jared D. McNeill</span>
- &lt;<a class="Mt" href="mailto:jmcneill@invisible.ca">jmcneill@invisible.ca</a>&gt;</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
-<p class="Pp">While no pronounced bugs are known to exist, several caveats can
- be mentioned:</p>
-<ul class="Bl-bullet">
- <li>Passive cooling is not implemented.</li>
- <li>There is no user-controllable way to switch between active and passive
- cooling, although the specifications support such transforms on some
- machines.</li>
- <li>The &#x201C;hot&#x201D; temperature is a threshold in which the system
- ought to be put into S4 sleep. This sleep state (&#x201C;suspend to
- disk&#x201D;) is not supported on <span class="Ux">NetBSD</span>.</li>
-</ul>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">January 9, 2011</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>