Ubuntu – How to disable the system from going to sleep

power-management

I am getting a web server setup at home on an older AMD 2400+ desktop. I have Ubuntu 11.04 installed and running however, after a time, I can no longer browse to the server. When I go to the keyboard and press a key, everything magically works again.

I have looked through the BIOS and I am not seeing any power saving features enabled. Is there anything like that in Ubuntu? Can it be disabled?

I don't have any GUI installed. This is console only.

Best Answer

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

From man systemctl:

mask NAME...  
           Mask one or more units, as specified on the command line. This
           will link these unit files to /dev/null, making it impossible to
           start them. This is a stronger version of disable, since it
           prohibits all kinds of activation of the unit, including
           enablement and manual activation. Use this option with care. This
           honors the --runtime option to only mask temporarily until the
           next reboot of the system. The --now option may be used to ensure
           that the units are also stopped. This command expects valid unit
           names only, it does not accept unit file paths.

 unmask NAME...
           Unmask one or more unit files, as specified on the command line.
           This will undo the effect of mask. This command expects valid
           unit names only, it does not accept unit file paths.
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