I can also reproduce this on both of my computers running Xubuntu 19.04, a desktop and a laptop.
Just to be extra clear on what the issue is: If the computer is left idle for 10 minutes, the screen locks. When 15 minutes have passed, it should suspend, but it never does. I unlock the screen to investigate why, and find that there is a prompt window asking my password in order to allow the system to suspend. What usually happens as a consequence: I fall asleep with the laptop still running, and on the next day the thing is powered off with only 1% of battery power. It stayed ON all night. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to policykit-desktop- privileges in Ubuntu. https://bugs.launchpad.net/bugs/1757375 Title: Desktop unable to Suspend when Inactive Status in policykit-desktop-privileges package in Ubuntu: Confirmed Bug description: On 16.04 (XFCE session and others) and possibly later the power- manager is unable to suspend the system when the user is inactive. A PK user-agent dialog is presented for the user to authenticate first - and as this action occurs specifically when the user is idle and away the PC can end up having an unplanned loss of power when the battery is exhausted. /var/log/auth.log shows: polkitd(authority=local): Operator of unix-session:c2 FAILED to authenticate to gain authorization for action org.freedesktop.login1.suspend for system-bus-name::1.47 [xfce4-power- manager --restart --sm-client-id 2992705d4-6fa2-4fba-966c- f7631ecd0b46] (owned by unix-user:tj) The problem seems to be "com.ubuntu.desktop.pkla" is missing an entry to allow Suspend. Currently it only has an entry for hibernate. Adding the following stanza solves the issue: [Enable suspend by default in logind] Identity=unix-user:* Action=org.freedesktop.login1.suspend;org.freedesktop.login1.inhibit-handle-suspend-key;org.freedesktop.login1;org.freedesktop.login1.suspend-multiple-sessions;org.freedesktop.login1.suspend-ignore-inhibit ResultActive=yes ResultInactive=yes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/policykit-desktop-privileges/+bug/1757375/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp