Provided by: freebsd-manpages_12.2-1_all 
NAME
acpi_ibm — ACPI extras driver for IBM laptops
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device acpi_ibm
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
acpi_ibm_load="YES"
DESCRIPTION
The acpi_ibm driver provides support for hotkeys and other components of IBM laptops. The main purpose
of this driver is to provide an interface, accessible via sysctl(8) and devd(8), through which
applications can determine the status of various laptop components.
While the sysctl(8) interface is enabled automatically after loading the driver, the devd(8) interface
has to be enabled explicitly, as it may alter the default action of certain keys. This is done by
setting the events sysctl as described below. Specifying which keys should generate events is done by
setting a bitmask, whereas each bit represents one key or key combination. This bitmask, accessible via
the eventmask sysctl, is set to availmask by default, a value representing all possible keypress events
on the specific ThinkPad model.
devd(8) Events
Hotkey events received by devd(8) provide the following information:
system "ACPI"
subsystem "IBM"
type The source of the event in the ACPI namespace. The value depends on the model.
notify Event code (see below).
Depending on the ThinkPad model, event codes may vary. On a ThinkPad T41p these are as follows:
0x01 Fn + F1
0x02 Fn + F2
0x03 Fn + F3 (LCD backlight)
0x04 Fn + F4 (Suspend to RAM)
0x05 Fn + F5 (Bluetooth)
0x06 Fn + F6
0x07 Fn + F7 (Screen expand)
0x08 Fn + F8
0x09 Fn + F9
0x0a Fn + F10
0x0b Fn + F11
0x0c Fn + F12 (Suspend to disk)
0x0d Fn + Backspace
0x0e Fn + Insert
0x0f Fn + Delete
0x10 Fn + Home (Brightness up)
0x11 Fn + End (Brightness down)
0x12 Fn + PageUp (ThinkLight)
0x13 Fn + PageDown
0x14 Fn + Space (Zoom)
0x15 Volume Up
0x16 Volume Down
0x17 Mute
0x18 Access IBM Button
led(4) Interface
The acpi_ibm driver provides a led(4) interface for the ThinkLight. The ThinkLight can be made to blink
by writing ASCII strings to the /dev/led/thinklight device.
SYSCTL VARIABLES
The following sysctls are currently implemented:
dev.acpi_ibm.0.initialmask
(read-only) Bitmask of ACPI events before the acpi_ibm driver was loaded.
dev.acpi_ibm.0.availmask
(read-only) Bitmask of all supported ACPI events.
dev.acpi_ibm.0.events
Enable ACPI events and set the eventmask to availmask. Without the acpi_ibm driver being loaded,
only the Fn+F4 button generates an ACPI event.
dev.acpi_ibm.0.eventmask
Sets the ACPI events which are reported to devd(8). Fn+F3, Fn+F4 and Fn+F12 always generate ACPI
events, regardless which value eventmask has. Depending on the ThinkPad model, the meaning of
different bits in the eventmask may vary. On a ThinkPad T41p this is a bitwise OR of the
following:
1 Fn + F1
2 Fn + F2
4 Fn + F3 (LCD backlight)
8 Fn + F4 (Suspend to RAM)
16 Fn + F5 (Bluetooth)
32 Fn + F6
64 Fn + F7 (Screen expand)
128 Fn + F8
256 Fn + F9
512 Fn + F10
1024 Fn + F11
2048 Fn + F12 (Suspend to disk)
4096 Fn + Backspace
8192 Fn + Insert
16384 Fn + Delete
32768 Fn + Home (Brightness up)
65536 Fn + End (Brightness down)
131072 Fn + PageUp (ThinkLight)
262144 Fn + PageDown
524288 Fn + Space (Zoom)
1048576 Volume Up
2097152 Volume Down
4194304 Mute
8388608 Access IBM Button
dev.acpi_ibm.0.hotkey
(read-only) Status of several buttons. Every time a button is pressed, the respecting bit is
toggled. It is a bitwise OR of the following:
1 Home Button
2 Search Button
4 Mail Button
8 Access IBM Button
16 Zoom
32 Wireless LAN Button
64 Video Button
128 Hibernate Button
256 ThinkLight Button
512 Screen Expand
1024 Brightness Up/Down Button
2048 Volume Up/Down/Mute Button
dev.acpi_ibm.0.lcd_brightness
Current brightness level of the display.
dev.acpi_ibm.0.volume
Speaker volume.
dev.acpi_ibm.0.mute
Indicates, whether the speakers are muted or not.
dev.acpi_ibm.0.thinklight
Indicates, whether the ThinkLight keyboard light is activated or not.
dev.acpi_ibm.0.bluetooth
Toggle Bluetooth chip activity.
dev.acpi_ibm.0.wlan
(read-only) Indicates whether the WLAN chip is active or not.
dev.acpi_ibm.0.fan
Indicates whether the fan is in automatic (1) or manual (0) mode. Default is automatic mode.
This sysctl should be used with extreme precaution, since disabling automatic fan control might
overheat the ThinkPad and lead to permanent damage if the fan_level is not set accordingly.
dev.acpi_ibm.0.fan_level
Indicates at what speed the fan should run when being in manual mode. Valid values range from 0
(off) to 7 (max) and 8. Level 8 is used by the driver to set the fan in unthrottled mode. In
this mode, the fan is set to spin freely and will quickly reach a very high speed. Use this mode
only if absolutely necessary, e.g., if the system has reached its critical temperature and it is
about to shut down. The resulting speed differs from model to model. On a T41p this is as
follows:
0 off
1, 2 ~3000 RPM
3, 4, 5 ~3600 RPM
6, 7 ~4300 RPM
8 ~6400 RPM (Full-speed, unthrottled)
dev.acpi_ibm.0.fan_speed
(read-only) Fan speed in rounds per minute. A few older ThinkPads report the fan speed in levels
ranging from 0 (off) to 7 (max).
dev.acpi_ibm.0.thermal
(read-only) Shows the readings of up to eight different temperature sensors. Most ThinkPads
include six or more temperature sensors but only expose the CPU temperature through
acpi_thermal(4). Some ThinkPads have the below sensor layout which might vary depending on the
specific model:
1. CPU
2. Mini PCI Module
3. HDD
4. GPU
5. Built-in battery
6. UltraBay battery
7. Built-in battery
8. UltraBay battery
dev.acpi_ibm.0.handlerevents
devd(8) events handled by acpi_ibm when events is set to 1. Events are specified as a
whitespace-separated list of event code in hexadecimal or decimal form. Note that the event
maybe handled twice (e.g., Brightness up/down) if ACPI BIOS already handled the event.
Defaults for these sysctls can be set in sysctl.conf(5).
FILES
/dev/led/thinklight ThinkLight led(4) device node
EXAMPLES
The following can be added to devd.conf(5) in order to pass button events to a
/usr/local/sbin/acpi_oem_exec.sh script:
notify 10 {
match "system" "ACPI";
match "subsystem" "IBM";
action "/usr/local/sbin/acpi_oem_exec.sh $notify ibm";
};
A possible /usr/local/sbin/acpi_oem_exec.sh script might look like:
#!/bin/sh
#
if [ "$1" = "" -o "$2" = "" ]
then
echo "usage: $0 notify oem_name"
exit 1
fi
NOTIFY=`echo $1`
LOGGER="logger"
CALC="bc"
BC_PRECOMMANDS="scale=2"
ECHO="echo"
CUT="cut"
MAX_LCD_BRIGHTNESS=7
MAX_VOLUME=14
OEM=$2
DISPLAY_PIPE=/tmp/acpi_${OEM}_display
case ${NOTIFY} in
0x05)
LEVEL=`sysctl -n dev.acpi_${OEM}.0.bluetooth`
if [ "$LEVEL" = "1" ]
then
sysctl dev.acpi_${OEM}.0.bluetooth=0
MESSAGE="bluetooth disabled"
else
sysctl dev.acpi_${OEM}.0.bluetooth=1
MESSAGE="bluetooth enabled"
fi
;;
0x10|0x11)
LEVEL=`sysctl -n dev.acpi_${OEM}.0.lcd_brightness`
PERCENT=`${ECHO} "${BC_PRECOMMANDS} ; \
${LEVEL} / ${MAX_LCD_BRIGHTNESS} * 100" |\
${CALC} | ${CUT} -d . -f 1`
MESSAGE="brightness level ${PERCENT}%"
;;
0x12)
LEVEL=`sysctl -n dev.acpi_${OEM}.0.thinklight`
if [ "$LEVEL" = "1" ]
then
MESSAGE="thinklight enabled"
else
MESSAGE="thinklight disabled"
fi
;;
0x15|0x16)
LEVEL=`sysctl -n dev.acpi_${OEM}.0.volume`
PERCENT=`${ECHO} "${BC_PRECOMMANDS} ; \
${LEVEL} / ${MAX_VOLUME} * 100" | \
${CALC} | ${CUT} -d . -f 1`
MESSAGE="volume level ${PERCENT}%"
;;
0x17)
LEVEL=`sysctl -n dev.acpi_${OEM}.0.mute`
if [ "$LEVEL" = "1" ]
then
MESSAGE="volume muted"
else
MESSAGE="volume unmuted"
fi
;;
*)
;;
esac
${LOGGER} ${MESSAGE}
if [ -p ${DISPLAY_PIPE} ]
then
${ECHO} ${MESSAGE} >> ${DISPLAY_PIPE} &
fi
exit 0
The following example specify that event code 0x04 (Suspend to RAM), 0x10 (Brightness up) and 0x11
(Brightness down) are handled by acpi_ibm.
sysctl dev.acpi_ibm.0.handlerevents='0x04 0x10 0x11'
in sysctl.conf(5):
dev.acpi_ibm.0.handlerevents=0x04\ 0x10\ 0x11
SEE ALSO
acpi(4), led(4), sysctl.conf(5), devd(8), sysctl(8)
HISTORY
The acpi_ibm device driver first appeared in FreeBSD 6.0.
AUTHORS
The acpi_ibm driver was written by Takanori Watanabe <takawata@FreeBSD.org> and later mostly rewritten by
Markus Brueffer <markus@FreeBSD.org>. This manual page was written by Christian Brueffer
<brueffer@FreeBSD.org> and Markus Brueffer <markus@FreeBSD.org>.
Debian June 24, 2020 ACPI_IBM(4)