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Juan Simón
Asked: 2011-10-10 03:09:16 +0800 CST

Prevent temporally suspend/hibernate from script?

  • 772

Is there any way to prevent temporally suspend/hibernate from a script?

I want the screen to enter in powersave mode when appropriate, but the computer doesn't stop. Caffeine doesn't allow this: it disables all or nothing.

Why I want to do this? Because sometimes I download huge amount of files from a server via FTP. These downloads can take hours to complete.

power-management

2 Answers

  1. To prvent hibernation, create /var/run/do-not-hibernate:

    sudo touch /var/run/do-not-hibernate

    The file /usr/lib/pm-utils/sleep.d/000kernel-change makes this work. If you need to disable suspend, create a new file for that, say /etc/pm/sleep.d/000_prevent_suspend_hibernate:

    #!/bin/sh
# Prevents the machine from suspending or hibernating when
# the file /var/run/do-not-hibernate-or-suspend exist
case "$1" in
  suspend|hibernate)
    [ -f /var/run/do-not-hibernate-or-suspend ] && exit 1
    ;;
esac

    Make it executable:

    sudo chmod +x /etc/pm/sleep.d/000_prevent_suspend_hibernate

    In case you need to prevent the machine from suspending or hibernating, create a file:

    sudo touch /var/run/do-not-hibernate-or-suspend

    After rebooting or removing this file, suspending and hibernating works again.

    • 6

  2. Simply add a file to /etc/pm/sleep.d In this file do you checks if suspend should be allowed. If not just exit with exit 1.

    For example: 

    tmp_start=...
tmp_stop=...

if [ $((tmp_stop)) -gt $((current_date)) -a $((tmp_start)) -lt $((current_date)) ]; then
    logger $0: Currently RECORDING. No Suspend!
    exit 1;
fi
    • 0