Trigger action on loss of AC power

NClement · 2014-02-07 18:43:23

Hello

I have a pretty old laptop (Dell Inspiron E1505) with a very short battery life (on the order of a minute) and a loose power cable. I would like to trigger my screen locker (/usr/bin/slock) when I lose AC power. However, I tried to enter this into acpid's handler.sh, but no slock. I am certainly not looking exclusively for an acpid solution either.

The result of systemctl status acpid:

acpid.service - ACPI event daemon
   Loaded: loaded (/usr/lib/systemd/system/acpid.service; enabled)
   Active: active (running) since Fri 2014-02-07 12:22:16 CST; 20min ago
 Main PID: 233 (acpid)
   CGroup: /system.slice/acpid.service
           └─233 /usr/bin/acpid -f

Feb 07 12:27:14 ollie logger[391]: ACPI group/action undefined: video/switchmode / VMOD
Feb 07 12:30:28 ollie logger[551]: ACPI group/action undefined: video/brightnessdown / BRTDN
Feb 07 12:30:28 ollie logger[553]: ACPI group/action undefined: video/brightnessdown / BRTDN
Feb 07 12:30:28 ollie logger[561]: ACPI group/action undefined: video/brightnessdown / BRTDN
Feb 07 12:30:29 ollie logger[579]: ACPI group/action undefined: video/brightnessdown / BRTDN
Feb 07 12:30:29 ollie logger[581]: ACPI group/action undefined: video/brightnessdown / BRTDN
Feb 07 12:30:34 ollie logger[617]: ACPI group/action undefined: video/brightnessup / BRTUP
Feb 07 12:30:38 ollie logger[667]: ACPI group/action undefined: video/brightnessdown / BRTDN
Feb 07 12:30:38 ollie logger[677]: ACPI group/action undefined: video/brightnessdown / BRTDN
Feb 07 12:35:35 ollie logger[773]: ACPI group/action undefined: processor / LNXCPU:00

#!/bin/bash
# Default acpi script that takes an entry for all actions

case "$1" in
    button/power)
        case "$2" in
            PBTN|PWRF)
                logger 'PowerButton pressed'
                ;;
            *)
                logger "ACPI action undefined: $2"
                ;;
        esac
        ;;
    button/sleep)
        case "$2" in
            SLPB|SBTN)
                logger 'SleepButton pressed'
                ;;
            *)
                logger "ACPI action undefined: $2"
                ;;
        esac
        ;;
    ac_adapter)
        case "$2" in
            AC|ACAD|ADP0)
                case "$4" in
                    00000000)
                        logger 'AC unpluged'
                        /usr/bin/slock &
                        ;;
                    00000001)
                        logger 'AC pluged'
                        ;;
                esac
                ;;
            *)
                logger "ACPI action undefined: $2"
                ;;
        esac
        ;;
    battery)
        case "$2" in
            BAT0)
                case "$4" in
                    00000000)
                        logger 'Battery online'
                        ;;
                    00000001)
                        logger 'Battery offline'
                        ;;
                esac
                ;;
            CPU0)
                ;;
            *)  logger "ACPI action undefined: $2" ;;
        esac
        ;;
    button/lid)
        case "$3" in
            close)
                logger 'LID closed'
                /etc/acpi/scripts/lid-close &
                ;;
            open)
                logger 'LID opened'
                /etc/acpi/scripts/lid-open &
                ;;
            *)
                logger "ACPI action undefined: $3"
                ;;
    esac
    ;;
    *)
        logger "ACPI group/action undefined: $1 / $2"
        ;;
esac

# vim:set ts=4 sw=4 ft=sh et:

and this is what is logged in journalctl when I unplug my power cord and then plug it back in:

Feb 07 12:36:37 ollie logger[781]: ACPI action undefined: ACPI0003:00
Feb 07 12:36:37 ollie logger[783]: ACPI group/action undefined: processor / LNXCPU:00
Feb 07 12:36:37 ollie logger[785]: ACPI group/action undefined: processor / LNXCPU:01
Feb 07 12:36:38 ollie logger[787]: ACPI action undefined: ACPI0003:00
Feb 07 12:36:38 ollie logger[789]: ACPI group/action undefined: processor / LNXCPU:00
Feb 07 12:36:38 ollie logger[791]: ACPI group/action undefined: processor / LNXCPU:01

Thanks!

Last edited by NClement (2014-02-07 19:06:20)

orschiro · 2014-02-08 09:18:40

Try using a Udev rule for that:

This Udev rule will automatically detect whether your laptop runs on battery or not and then runs slock accordingly.

You have to experiment whether it is 0 or 1 though.

/etc/udev/rules.d/50-slock-battery.rules

SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", RUN+="/usr/bin/slock"
SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", RUN+="/usr/bin/slock"

Last edited by orschiro (2014-02-08 09:18:56)

brebs · 2014-02-08 10:18:21

My ACPI handler detects mains power turning on/off, and runs a script.

NClement · 2014-02-10 19:32:34

Okay, so the did what I asked for, but as it turns out I asked for the wrong thing. Slock is getting triggered just fine, but it is seg faulting every time I unplug my laptop - I am pretty sure because it need to be run from within an X session. It needs to know the display I am trying to slock. Is there a way to hand the X display to slock somehow? Otherwise is there some udev variable I can keep querying in order to check the power supply status? The POWER_SUPPLY_ONLINE=0 does seem to be the right thing, but can check that from my own script?

orschiro · 2014-02-10 20:37:53

@NClement

Try prepending DISPLAY:

/etc/udev/rules.d/50-slock-battery.rules

SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", RUN+="export DISPLAY:0 ; /usr/bin/slock"
SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", RUN+="export DISPLAY:0 ; /usr/bin/slock"

brebs · 2014-02-10 21:26:02

See display in udev, for correct method(s).

orschiro · 2014-02-10 21:29:19

@brebs

Thanks! Good to remember!

Arch Linux

#1 2014-02-07 18:43:23

Trigger action on loss of AC power

#2 2014-02-08 09:18:40

Re: Trigger action on loss of AC power

#3 2014-02-08 10:18:21

Re: Trigger action on loss of AC power

#4 2014-02-10 19:32:34

Re: Trigger action on loss of AC power

#5 2014-02-10 20:37:53

Re: Trigger action on loss of AC power

#6 2014-02-10 21:26:02

Re: Trigger action on loss of AC power

#7 2014-02-10 21:29:19

Re: Trigger action on loss of AC power

Board footer