Authentication required before suspend

1. In command line run:

   locate -b org.freedesktop.login1.policy
   

   The found file is /usr/share/polkit-1/actions/org.freedesktop.login1.policy.

2. In the file, near line

   <action id="org.freedesktop.login1.suspend">
   

   check these:

   <defaults>
       <allow_any>yes</allow_any>
       <allow_inactive>yes</allow_inactive>
       <allow_active>yes</allow_active>
   </defaults>
   

^(Source)

Using Polkit

Add yourself to users group by

sudo usermod -aG users "$USER"

You need to reboot your computer after the following steps.

1. If PolKit version >= 0.106

You can check version of Polkit by: pkaction --version

If PolKit version < 0.106, there are NO .rules files but only old .pkla and .conf files because those Polkit versions do not have the Javascript interpreter.

Just adding a file /etc/polkit-1/rules.d/85-suspend.rules with:

polkit.addRule(function(action, subject) {
    if (action.id == "org.freedesktop.login1.suspend" &&
        subject.isInGroup("users")) {
        return polkit.Result.YES;
    }
});

And in Terminal, type:

sudo chmod 755 /etc/polkit-1/rules.d
sudo chmod 644 /etc/polkit-1/rules.d/85-suspend.rules

2. If PolKit version < 0.106

In this case, adding a file /var/lib/polkit-1/localauthority/50-local.d/50-enable-suspend-on-lockscreen.pkla with:

[Allow suspending in lockscreen]
Identity=unix-group:users
Action=org.freedesktop.login1.suspend
ResultAny=yes
ResultInactive=yes
ResultActive=yes

In bash, type:

sudo chmod 644 /var/lib/polkit-1/localauthority/50-local.d/50-enable-suspend-on-lockscreen.pkla

More about pklocalauthority

Using Power Manager settings (not sure if it works)

In XFCE Power Manager:

1. Under the Security tab:

   • Set Automatically lock the session to Never
   • Check Lock the screen when the system is going for sleep
2. Under the Display tab, blank the screen after 15 minutes. Set Sleep and Switch off times to be disabled (greyed out).
3. Under the System tab, set system sleep mode to Suspend after an half of hour.

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References:

• stintel's blog
• bugs.launchpad.net