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NAME
acpi_hp — ACPI extras driver for HP laptops
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel
configuration file:
device acpi_hp
Alternatively, to load the driver as a module at boot time, place the following line in
loader.conf(5):
acpi_hp_load="YES"
DESCRIPTION
The acpi_hp driver provides support for ACPI-controlled features found on HP laptops that
use a WMI enabled BIOS (e.g., HP Compaq 8510p and 6510p).
The main purpose of this driver is to provide an interface, accessible via sysctl(8),
devd(8) and devfs(8), through which applications can determine and change the status of
various laptop components and BIOS settings.
devd(8) Events
Devd events received by devd(8) provide the following information:
system "ACPI"
subsystem "HP"
type The source of the event in the ACPI namespace. The value depends on the
model.
notify Event code (see below).
Event codes:
0xc0 WLAN on air status changed to 0 (not on air)
0xc1 WLAN on air status changed to 1 (on air)
0xd0 Bluetooth on air status changed to 0 (not on air)
0xd1 Bluetooth on air status changed to 1 (on air)
0xe0 WWAN on air status changed to 0 (not on air)
0xe1 WWAN on air status changed to 1 (on air)
devfs(8) Device
You can read /dev/hpcmi to see your current BIOS settings. The detail level can be adjusted
by setting the sysctl cmi_detail as described below.
SYSCTL VARIABLES
The following sysctls are currently implemented:
WLAN:
dev.acpi_hp.0.wlan_enabled
Toggle WLAN chip activity.
dev.acpi_hp.0.wlan_radio
(read-only) WLAN radio status (controlled by hardware switch)
dev.acpi_hp.0.wlan_on_air
(read-only) WLAN on air (chip enabled, hardware switch enabled + enabled in BIOS)
dev.acpi_hp.0.wlan_enabled_if_radio_on
If set to 1, the WLAN chip will be enabled if the radio is turned on
dev.acpi_hp.0.wlan_disable_if_radio_off
If set to 1, the WLAN chip will be disabled if the radio is turned off
Bluetooth:
dev.acpi_hp.0.bt_enabled
Toggle Bluetooth chip activity.
dev.acpi_hp.0.bt_radio
(read-only) Bluetooth radio status (controlled by hardware switch)
dev.acpi_hp.0.bt_on_air
(read-only) Bluetooth on air (chip enabled, hardware switch enabled + enabled in
BIOS)
dev.acpi_hp.0.bt_enabled_if_radio_on
If set to 1, the Bluetooth chip will be enabled if the radio is turned on
dev.acpi_hp.0.bt_disable_if_radio_off
If set to 1, the Bluetooth chip will be disabled if the radio is turned off
WWAN:
dev.acpi_hp.0.wwan_enabled
Toggle WWAN chip activity.
dev.acpi_hp.0.wwan_radio
(read-only) WWAN radio status (controlled by hardware switch)
dev.acpi_hp.0.wwan_on_air
(read-only) WWAN on air (chip enabled, hardware switch enabled + enabled in BIOS)
dev.acpi_hp.0.wwan_enabled_if_radio_on
If set to 1, the WWAN chip will be enabled if the radio is turned on
dev.acpi_hp.0.wwan_disable_if_radio_off
If set to 1, the WWAN chip will be disabled if the radio is turned off
Misc:
dev.acpi_hp.0.als_enabled
Toggle ambient light sensor (ALS)
dev.acpi_hp.0.display
(read-only) Display status (bitmask)
dev.acpi_hp.0.hdd_temperature
(read-only) HDD temperature
dev.acpi_hp.0.is_docked
(read-only) Docking station status (1 if docked)
dev.acpi_hp.0.cmi_detail
Bitmask to control detail level in /dev/hpcmi output (values can be ORed).
0x01 Show path component of BIOS setting
0x02 Show a list of valid options for the BIOS setting
0x04 Show additional flags of BIOS setting (ReadOnly etc.)
0x08 Query highest BIOS entry instance. This is broken on many HP models and
therefore disabled by default.
dev.acpi_hp.0.verbose
(read-only) Set verbosity level
Defaults for these sysctls can be set in sysctl.conf(5).
HARDWARE
The acpi_hp driver has been reported to support the following hardware:
• HP Compaq 8510p
• HP Compaq nx7300
It should work on most HP laptops that feature a WMI enabled BIOS.
FILES
/dev/hpcmi Interface to read BIOS settings
EXAMPLES
The following can be added to devd.conf(5) in order disable the LAN interface when WLAN on
air and reenable if it is not:
notify 0 {
match "system" "ACPI";
match "subsystem" "HP";
match "notify" "0xc0";
action "ifconfig em0 up";
};
notify 0 {
match "system" "ACPI";
match "subsystem" "HP";
match "notify" "0xc1";
action "ifconfig em0 down";
};
Enable the ambient light sensor:
sysctl dev.acpi_hp.0.als_enabled=1
Enable Bluetooth:
sysctl dev.acpi_hp.0.bt_enabled=1
Get BIOS settings:
cat /dev/hpcmi
Serial Port Disable
Infrared Port Enable
Parallel Port Disable
Flash Media Reader Disable
USB Ports including Express Card slot Enable
1394 Port Enable
Cardbus Slot Disable
Express Card Slot Disable
(...)
Set maximum detail level for /dev/hpcmi output:
sysctl dev.acpi_hp.0.cmi_detail=7
SEE ALSO
acpi(4), acpi_wmi(4), sysctl.conf(5), devd(8), devfs(8), sysctl(8)
HISTORY
The acpi_hp device driver first appeared in FreeBSD 8.0.
AUTHORS
The acpi_hp driver was written by Michael Gmelin <freebsd@grem.de>.
It has been inspired by hp-wmi driver, which implements a subset of these features (hotkeys)
on Linux.
HP CMI whitepaper:
http://h20331.www2.hp.com/Hpsub/downloads/cmi_whitepaper.pdf
wmi-hp for Linux:
http://www.kernel.org
WMI and ACPI:
http://www.microsoft.com/whdc/system/pnppwr/wmi/wmi-acpi.mspx
This manual page was written by Michael Gmelin <freebsd@grem.de>.
BUGS
This driver is experimental and has only been tested on i386 on an HP Compaq 8510p which
featured all supported wireless devices (WWAN/BT/WLAN). Expect undefined results when
operating on different hardware.
Loading the driver is slow. Reading from /dev/hpcmi is even slower.
Additional features like HP specific sensor readings or writing BIOS settings are not
supported.