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+<table class="head">
+ <tr>
+ <td class="head-ltitle">HWPSTATE_INTEL(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">HWPSTATE_INTEL(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">hwpstate_intel</code> &#x2014;
+ <span class="Nd">Intel Speed Shift Technology 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 your kernel place the following line
+ in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device cpufreq</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">hwpstate_intel</code> driver provides support
+ for hardware-controlled performance states on Intel platforms, also known as
+ Intel Speed Shift Technology.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
+ TUNABLES</a></h1>
+<dl class="Bl-tag">
+ <dt id="hint.hwpstate_intel.0.disabled"><var class="Va">hint.hwpstate_intel.0.disabled</var></dt>
+ <dd>Can be used to disable <code class="Nm">hwpstate_intel</code>, allowing
+ other compatible drivers to manage performance states, like
+ <a class="Xr">est(4)</a>. Defaults to &quot;0&quot; (enabled).</dd>
+ <dt id="machdep.hwpstate_pkg_ctrl"><var class="Va">machdep.hwpstate_pkg_ctrl</var></dt>
+ <dd>Selects between package-level control (the default) and per-core control.
+ &quot;1&quot; selects package-level control and &quot;0&quot; selects
+ core-level control.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
+ VARIABLES</a></h1>
+<p class="Pp">The following <a class="Xr">sysctl(8)</a> values are available</p>
+<dl class="Bl-tag">
+ <dt id="dev.hwpstate_intel._d._desc"><var class="Va">dev.hwpstate_intel.%d.%desc</var></dt>
+ <dd>Describes the attached driver</dd>
+ <dt>dev.hwpstate_intel.0.%desc: Intel Speed Shift</dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+ <dt id="dev.hwpstate_intel._d._driver"><var class="Va">dev.hwpstate_intel.%d.%driver</var></dt>
+ <dd>Driver in use, always hwpstate_intel.</dd>
+ <dt>dev.hwpstate_intel.0.%driver: hwpstate_intel</dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+ <dt id="dev.hwpstate_intel._d._parent"><var class="Va">dev.hwpstate_intel.%d.%parent</var></dt>
+ <dd>The CPU that is exposing these frequencies. For example
+ <var class="Va">cpu0</var>.</dd>
+ <dt>dev.hwpstate_intel.0.%parent: cpu0</dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+ <dt id="dev.hwpstate_intel._d.epp"><var class="Va">dev.hwpstate_intel.%d.epp</var></dt>
+ <dd>Energy/Performance Preference. Valid values range from 0 to 100. Setting
+ this field conveys a hint to the hardware regarding a preference towards
+ performance (at value 0), energy efficiency (at value 100), or somewhere
+ in between.</dd>
+ <dt>dev.hwpstate_intel.0.epp: 0</dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="COMPATIBILITY"><a class="permalink" href="#COMPATIBILITY">COMPATIBILITY</a></h1>
+<p class="Pp"><code class="Nm">hwpstate_intel</code> is only found on supported
+ Intel CPUs.</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">cpufreq(4)</a></p>
+<p class="Pp"><cite class="Rs"><span class="RsT">Intel 64 and IA-32
+ Architectures Software Developer Manuals</span>,
+ <a class="RsU" href="http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html">http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html</a>.</cite></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp">This manual page was written by <span class="An">D Scott
+ Phillips</span>
+ &lt;<a class="Mt" href="mailto:scottph@FreeBSD.org">scottph@FreeBSD.org</a>&gt;.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">April 21, 2020</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>