I have the same problem using XFCE on Ubuntu 17.10. But Markus's solution does fix the problem.
My setup is as follows: In XFCE Power Manager under the security tab set: Automatically lock the session to "Never" Uncheck "Lock the screen when the system is going for sleep". Under the display tab I still blank the screen after 15 minutes. Put to sleep and Switch off times appear to be disabled (greyed out). Under the system tab I still have system sleep mode going to "Suspend" after an hour. Interestingly the screen still locks when it suspends. So everything still works fine and as I want it to. I get a full screen white on black message when I activate the machine again telling me the screen is locked and to wait a few seconds for a dialog box to appear. Haven't seen that before but fine nonetheless. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1605189 Title: Authentication is required for suspending the system Status in systemd package in Ubuntu: Confirmed Bug description: Automatic suspend from the xfce power manager does not work, as a window opens and asks for my password. Well, if it wants to suspend the system after a given timeout, I cannot enter my password as I'm not in front of my system then. Once I'm able to enter my password it is too late to run the suspend action. The window asking for my password prints: Password: <field-to-enter-the password> Details Action: org.freedesktop.login1.suspend Vendor: The systemd project ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: systemd 229-4ubuntu7 ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13 Uname: Linux 4.4.0-31-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: XFCE Date: Thu Jul 21 13:13:12 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2014-08-17 (703 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: LENOVO 4236ML1 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic root=/dev/mapper/ubuntu--vg-root ro intel_pstate=enable SourcePackage: systemd SystemdDelta: [EXTENDED] /lib/systemd/system/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf [EXTENDED] /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf 2 overridden configuration files found. UpgradeStatus: Upgraded to xenial on 2016-05-28 (53 days ago) dmi.bios.date: 07/05/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 83ET76WW (1.46 ) dmi.board.asset.tag: Not Available dmi.board.name: 4236ML1 dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr83ET76WW(1.46):bd07/05/2013:svnLENOVO:pn4236ML1:pvrThinkPadT420:rvnLENOVO:rn4236ML1:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4236ML1 dmi.product.version: ThinkPad T420 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1605189/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
