Module Name: src
Committed By: jruoho
Date: Thu Dec 30 12:06:53 UTC 2010
Modified Files:
src/share/man/man4: acpicpu.4
Log Message:
Update.
To generate a diff of this commit:
cvs rdiff -u -r1.20 -r1.21 src/share/man/man4/acpicpu.4
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/share/man/man4/acpicpu.4
diff -u src/share/man/man4/acpicpu.4:1.20 src/share/man/man4/acpicpu.4:1.21
--- src/share/man/man4/acpicpu.4:1.20 Mon Dec 20 09:11:37 2010
+++ src/share/man/man4/acpicpu.4 Thu Dec 30 12:06:53 2010
@@ -1,4 +1,4 @@
-.\" $NetBSD: acpicpu.4,v 1.20 2010/12/20 09:11:37 wiz Exp $
+.\" $NetBSD: acpicpu.4,v 1.21 2010/12/30 12:06:53 jruoho Exp $
.\"
.\" Copyright (c) 2010 Jukka Ruohonen <jruoho...@iki.fi>
.\" All rights reserved.
@@ -24,7 +24,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd December 20, 2010
+.Dd December 30, 2010
.Dt ACPICPU 4
.Os
.Sh NAME
@@ -185,11 +185,11 @@
For example, if
.Xr acpiacad 4
is disconnected, the maximum available frequency may be lowered.
-Currently the
+By default,
+the
.Nx
-implementation reacts to these events by imposing the dynamic maximum, but
-.Nm
-does not take any actions to manipulate the frequencies by itself.
+implementation may manipulate the frequencies
+according to the notifications from the firmware.
.Ss T-states
Processor T-states, or
.Dq throttling states ,
@@ -250,17 +250,6 @@
a high temperature situation exists.
After the temperatures have returned to non-critical levels,
the modulation ceases.
-.Ss Statistics
-The
-.Nm
-driver uses event counters to track the times
-a processor has entered a given state.
-It is possible to view the statistics by using
-.Xr vmstat 1
-(with the
-.Fl e
-flag).
-Note that valid per-CPU data is available only for C-states.
.Ss System Control Variables
The
.Nm
@@ -277,7 +266,30 @@
.Ic machdep.powernow .
Please note that future versions of
.Nm
-may however remove the system control variables without further notice.
+may however remove these system control variables without further notice.
+.Pp
+In addition, the following two variables are available.
+.Bl -tag -width "hw.acpi.cpu.dynamic" -offset indent
+.It Ic hw.acpi.cpu.dynamic
+A boolean that controls whether the states are allowed to change dynamically.
+When enabled, C-, P-, and T-states may all change at runtime, and
+.Nm
+may also take actions based on requests from the firmware.
+.It Ic hw.acpi.cpu.passive
+A boolean that enables or disables automatic processor thermal management via
+.Xr acpitz 4 .
+.El
+.Ss Statistics
+The
+.Nm
+driver uses event counters to track the times
+a processor has entered a given state.
+It is possible to view the statistics by using
+.Xr vmstat 1
+(with the
+.Fl e
+flag).
+Note that valid per-CPU data is available only for C-states.
.Sh COMPATIBILITY
The
.Nm
