acpi_ibm(4) 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.conf5:


acpi_ibm_load="YES"

DESCRIPTION

The 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)SsEvents

Hotkey events received by devd(8) provide the following information:

system
Qq Li ACPI
subsystem
Qq Li 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)SsInterface

The 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 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 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. Values are ranging from 0 (off) to 7 (max). 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

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_thermal4. 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 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 (eg. Brightness up/down) if ACPI BIOS already handled the event.

Defaults for these sysctls can be set in sysctl.conf5.

FILES

/dev/led/thinklight
ThinkLight led(4) device node

EXAMPLES

The following can be added to devd.conf5 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 . 

sysctl dev.acpi_ibm.0.handlerevents='0x04 0x10 0x11'

in sysctl.conf5: 

dev.acpi_ibm.0.handlerevents=0x04\ 0x10\ 0x11

HISTORY

The device driver first appeared in Fx 6.0 .

AUTHORS

An -nosplit The driver was written by An Takanori Watanabe Aq [email protected] and later mostly rewritten by An Markus Brueffer Aq [email protected] . This manual page was written by An Christian Brueffer Aq [email protected] and An Markus Brueffer Aq [email protected] .

SEE ALSO

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