How to disable all power management in Ubuntu (for a server netbook)?
Solution 1:
On Ubuntu 16.04 LTS, I successfully used the following to disable suspend:
sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target
And this to re-enable it:
sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target
Solution 2:
You can disable those power management features at various level.
Graphical User Interface level
In GNOME, you should edit the following file:
sudoedit /usr/share/polkit-1/actions/org.freedesktop.upower.policy
One section concerns the suspend function and the other the hibernate one. Each as a tag that you have to set to no:
<allow_active>no</allow_active>
Keyboard level
Now, to avoid the problem if the keyboard has some related keys for these features, you have to enter the following command:
gconftool -s /apps/gnome-power-manager/buttons/hibernate -t string interactive
Command line level
It would still be possible to trigger a suspend or hibernation from the command line, here is how to disable it.
We have to create an executable script in /etc/pm/sleep.d/
that will cancel any hibernate or suspend actions.
sudoedit /etc/pm/sleep.d/000cancel-hibernate-suspend
The content of this file should be:
#!/bin/sh
# prevents hibernation and suspend
. "$PM_FUNCTIONS"
case "${1}" in
suspend|hibernate)
inhibit
;;
resume|thaw)
exit 0
;;
esac
Now make that file executable:
chmod 0755 /etc/pm/sleep.d/000cancel-hibernate-suspend