acpi_thermal(4) [debian man page]

ACPI_THERMAL(4) 					   BSD Kernel Interfaces Manual 					   ACPI_THERMAL(4)

NAME

     acpi_thermal -- ACPI thermal management subsystem

SYNOPSIS

     device acpi

DESCRIPTION

     The acpi_thermal driver provides the thermal management features of the ACPI module.  This driver has a sysctl(8) interface and a devd(8)
     notification interface.  The sysctls export properties of each ACPI thermal zone object.

     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.

     The acpi_thermal driver also activates the active cooling system according to each thermal zone's setpoints.

SYSCTL VARIABLES

     hw.acpi.thermal.min_runtime
	     Number of seconds to continue active cooling once started.  A new active cooling level will not be selected until this interval
	     expires.

     hw.acpi.thermal.polling_rate
	     Number of seconds between polling the current temperature.

     hw.acpi.thermal.user_override
	     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).

     hw.acpi.thermal.tz%d.active
	     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.

     hw.acpi.thermal.tz%d.passive_cooling
	     If set to 1, passive cooling is enabled.  It does cooling without fans using cpufreq(4) as the mechanism for controlling CPU speed.
	     Default is enabled for tz0 where it is available.

     hw.acpi.thermal.tz%d.thermal_flags
	     Current thermal zone status.  These are bit-masked values.

     hw.acpi.thermal.tz%d.temperature
	     Current temperature for this zone.

     hw.acpi.thermal.tz%d._PSV
	     Temperature to start passive cooling by throttling down CPU, etc.	This value can be overridden by the user.

     hw.acpi.thermal.tz%d._HOT
	     Temperature to start critical suspend to disk (S4).  This value can be overridden by the user.

     hw.acpi.thermal.tz%d._CRT
	     Temperature to start critical shutdown (S5).  This value can be overridden by the user.

     hw.acpi.thermal.tz%d._ACx
	     Temperatures at which to switch to the corresponding active cooling level.  The lower the _ACx value, the higher the cooling power.

     All temperatures are printed in Celsius.  Values can be set in Celsius (by providing a trailing "C") or Kelvin (by leaving off any trailing
     letter).  When setting a value by sysctl(8), do not specify a trailing decimal (i.e., 90C instead of 90.0C).

NOTIFIES

     Notifies are passed to userland via devd(8).  See /etc/devd.conf and devd.conf(5) for examples.  The acpi_thermal driver sends events with
     the following attributes:

     system	ACPI
     subsystem	Thermal
     type	The fully qualified thermal zone object path as in the ASL.
     notify	An integer designating the event:

		0x80	Current temperature has changed.
		0x81	One or more trip points (_ACx, _PSV) have changed.
		0x82	One or more device lists (_ALx, _PSL, _TZD) have changed.
		0xcc	Non-standard notify that the system will shutdown if the temperature stays above _CRT or _HOT for one more poll cycle.

SEE ALSO

     acpi(4), cpufreq(4), acpidump(8)

AUTHORS

     Michael Smith

     This manual page was written by Takanori Watanabe.

BSD
								  March 17, 2007							       BSD

Check Out this Related Man Page

ACPI_TOSHIBA(4) 					   BSD Kernel Interfaces Manual 					   ACPI_TOSHIBA(4)

NAME

     acpi_toshiba -- Toshiba HCI interface

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel configuration file:

	   device acpi_toshiba

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   acpi_toshiba_load="YES"

DESCRIPTION

     HCI is Toshiba's Hardware Control Interface which is somewhat uniform across their models.  The acpi_toshiba driver allows the user to manip-
     ulate HCI-controlled hardware using a number of sysctl(8) variables.

SYSCTL VARIABLES

     The following sysctls are currently implemented:

     hw.acpi.toshiba.force_fan
	     Causes active cooling to be forcibly enabled ('1') or disabled ('0') regardless of the current temperature.

     hw.acpi.toshiba.video_output
	     Sets the active display to use according to a bitwise OR of the following:

	     0	     No display
	     1	     LCD
	     2	     CRT
	     4	     TV-Out

	     Only some systems (i.e., the Libretto L5) support video switching via this hardware-specific driver.  Use the acpi_video(4) driver
	     for generic video output support.

     hw.acpi.toshiba.lcd_brightness
	     Makes the LCD backlight brighter or dimmer (higher values are brighter).

     hw.acpi.toshiba.lcd_backlight
	     Turns the LCD backlight on and off.

     hw.acpi.toshiba.cpu_speed
	     Sets the CPU speed to the specified speed.  This provides functionality similar to the hw.acpi.cpu.throttle_state variable.  Higher
	     sysctl values mean lower CPU speeds.

     Defaults for these variables can be set in sysctl.conf(5), which is parsed at boot-time.

LOADER TUNABLES

     The hw.acpi.toshiba.enable_fn_keys tunable enables or disables the function keys on the keyboard.	Function keys are enabled by default.

     This behaviour can be changed at the loader(8) prompt or in loader.conf(5).

SEE ALSO

     acpi(4), acpi_video(4), loader.conf(5), sysctl.conf(5), sysctl(8)

HISTORY

     The acpi_toshiba driver first appeared in FreeBSD 5.1.

AUTHORS

     The acpi_toshiba driver was written by Hiroyuki Aizu <aizu@navi.org>.  This manual page was written by Philip Paeps <philip@FreeBSD.org>.

BSD
								 February 8, 2010							       BSD

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acpi_thermal(4) [debian man page]

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