Ubuntu 15.04, pm-utils do not look into /etc/pm/power.d/ anymore, what instead?

Question

Since upgrade from 14.10 to 15.04 my custom script which I used to setup proper thermal profile mode for my laptop ceased to work, which I believe is because pm-utils do not respond to AC/BAT switching.

Now, if that is new intended behavior of the system, where now should I put my script to do that job (required for my laptop to run properly even on AC power)?

Answer 1

Ok, found an answer in Arch Wiki. They give the next solution:

There is just one thing systemd cannot do (as of systemd-204): power management depending on whether the system is running on AC or battery. To fill this gap, you can create a single udev rule that runs a script when the AC adapter is plugged and unplugged:

/etc/udev/rules.d/powersave.rules
SUBSYSTEM=="power_supply", ATTR{online}=="0", RUN+="/path/to/your/script true"
SUBSYSTEM=="power_supply", ATTR{online}=="1", RUN+="/path/to/your/script false"

For my Sony Vaio, I have this as my personal setup:

/etc/udev/rules.d/99-laptopac.rules

SUBSYSTEM=="power_supply", ATTR{online}=="0", RUN+="/usr/local/bin/sony-thermal.sh true"
SUBSYSTEM=="power_supply", ATTR{online}=="1", RUN+="/usr/local/bin/sony-thermal.sh false"

/usr/local/bin/sony-thermal.sh

#!/bin/sh

help() {
    cat <&ltEOF
$0: SONY laptop thermal profile management

This script selects between "performance" and "silent" modes depending
on whether laptop runs on AC power or battery power.

EOF
}

set_sony_thermal_profile() {
    [ ! -d /sys/devices/platform/sony-laptop ] && exit $NA
    [ ! -f /sys/devices/platform/sony-laptop/thermal_control ] && exit $NA
    case $1 in
    performance) 
        printf "Setting SONY thermal control to performace mode."
        thermal_control=performance ;;
    silent)
        printf "Setting SONY thermal control to silent mode."
        thermal_control=silent ;;
    *)
        printf "Setting SONY thermal control to balanced mode."
        thermal_control=balanced ;;
    esac
    echo "$thermal_control" > /sys/devices/platform/sony-laptop/thermal_control && echo Done. || \
    echo Failed.
}

case $1 in
    true) set_sony_thermal_profile silent ;;
    false) set_sony_thermal_profile performance ;;
    help) help ;;
    *) exit $NA ;;
esac

exit 0

This prevents CPU in my notebook to go into "throttling" continuously even at light loading conditions with great performance and user experience losses.

Answer 2

Default Ubuntu power scripts can be triggered this way.

Add a file pm-utils with this content

SUBSYSTEM=="power_supply", ATTR{online}=="0", RUN+="/usr/sbin/pm-powersave true"
SUBSYSTEM=="power_supply", ATTR{online}=="1", RUN+="/usr/sbin pm-powersave false"

to /etc/udev/rules.d/

And the default Ubuntu powersave features will be applied when you switch from the battery to AC and back.

There is a problem that it is not triggered on boot. To fix it, add

udevadm trigger -s power_supply

to /etc/rc.local before exit0.

With Ubuntu 16.04 another problem is that Network Manager defaults to Power management off. When an interface is brought up, it overrides the pm-utils setting.

This can also be fixed by adding a file 02-powersave

#!/bin/sh

[ "$1" = "wlan0" ] && [ "$2" = "up" ] && udevadm trigger -s power_supply

to /etc/NetworkManager/dispatcher.d.

Note: You need to replace wlan0 with your wireless interface that can be found in ifconfig.