Manual Pages  — 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"

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.

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

Defaults for these sysctls can be set in sysctl.conf(5).

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