As they write in the bug using xscreensaver is a workaround. I have at ~/.config/lxsession/Lubuntu/autostart
@xscreensaver -no-splash @xfce4-power-manager My other settings: xfce http://s8.postimg.org/77s30nh4l/sc1.png xscreensaver http://s30.postimg.org/orhazyztt/sc2.png I think Light Locker can achive same, you have to make sure it is started at login with correct settings too: http://s9.postimg.org/qv43933rj/sc3.png Some of these overwrite each other settings, so make sure you set same settings in all of them as shown in the screen-shots above. Only then it works. Hope this helps. On 19/12/14 19:22, John Hupp wrote: > My most-hated-bugs list includes > https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1193716. > If you are streaming video in your browser, after 10 minutes it will > blank and then lock the screen (unless you keep moving the mouse). > The bug has been fixed for 14.10, but policy has prevented the fix > from being back-ported to the LTS. Worry about a regression I > suppose, but a usability black eye for the LTS. > > I wrote a script that toggles to a pseudo Presentation Mode (and back > to Normal Mode if you run it again) and notifies the user of the > present mode. I also made up a desktop entry file named Power Mode > Toggler that will run the script from the Preferences menu. > > Note that the Presentation Mode settings are not permanent, but expire > with the session. > > To use these, install the very small libnotify-bin package, which is > required for the user notifications. Then as root, create both files > in /usr/local/share/applications (or an equivalent location). > Remember to make the script executable. > > ------------------------------------------------------------------------ > > #!/bin/bash > # /usr/local/share/applications/xset-mode.sh > # A script to toggle between Presentation and Normal mode and notify > the user of the mode > > STATUS_MONITOR=$(xset q | grep "DPMS is" | awk '{print $3}') > > if [ "$STATUS_MONITOR" == "Enabled" ]; then > > xset s off > xset -dpms > notify-send -t 5000 “The computer is now in Presentation Mode” > > else > > xset s on > xset +dpms > notify-send -t 5000 “The computer is now in Normal Mode” > > fi > > ------------------------------------------------------------------------ > > A desktop entry file to run the script and appear in the Preferences > menu as Power Mode Toggler: > /usr/local/share/applications/power-mode-toggler.desktop > > [Desktop Entry] > Version=1.0 > > Type=Application > > Name=Power Mode Toggle > Icon=xfpm-ac-adapter > > Exec=bash /usr/local/share/applications/xset-mode.sh > Terminal=false > > Categories=Settings > Name[en_US]=Power Mode Toggler > Comment[en_US]=Toggle between Presentation and Normal Mode > > ------------------------------------------------------------------------ > > *Arcane Background Reading* > > A summary of my research into this problem: > > /*Command Line Behavior*/ > > Command line utility xset sets the X user preferences > > Some commands: > xset q - queries the current settings for the X user preferences > xset s on/off - turn the screen saver functions on or off > xset -dpms/+dpms - disables/enables the DPMS functions > > xset q output includes these two sections which determine the screen > behavior: > > Screen Saver: > prefer blanking: yes allow exposures: yes > timeout: 600 cycle: 600 > > DPMS (Energy Star): > Standby: 600 Suspend: 0 Off: 900 > DPMS is Enabled > Monitor is On > > This xset output is the reliable indicator of behavior, not the GUI > interfaces. > > An ad hoc Presentation Mode: > $ xset s off # sets Screen Saver timeout: 0 > $ xset -dpms # disables DPMS, though leaving the Standby, Suspend, > Off values unaffected > This works! > > An ad hoc Normal Mode: > $ xset s on # sets Screen Saver timeout to the X default: 600 > $ xset +dpms # enables DPMS with whatever Standby, Suspend, Off > values are current > > ------------------------------------------------------------------------ > > /*GUI Interface Behavior (A Mess)*/ > > Menu: Preferences: Power Manager, Light Locker > (xfce4-power-manager-settings, light-locker-settings) > > Changing settings in LL/XPM will also change the output of xset q, but > changing settings via xset does not result in changes to the LL/XPM > interfaces. Perhaps a reboot would effect that. > > If you set XPM systray icon to always appear and right-click it, you > can choose Mode: Normal/Presentation. But Presentation Mode merely > disables DPMS and does not turn off the screen saver. > > Note that light-locker-settings and xfce4-power-manager-settings both > offer sliders to set monitor blank/sleep and monitor switched off. > But these operate in lock-step: changing a slider setting in LL will > also change it in XPM. However, the effects in xset depend on which > interface you made the change from!!! > > XPM: By default the monitor-sleep slider affects DPMS Standby, but the > Extended tab can set it to affect DPMS Suspend instead. The > monitor-offs slider affects DPMS Off. XPM has no effect on the Screen > Saver section. > > LL: The monitor-blank slider affects Screen Saver timeout. The > monitor-off slider affects DPMS Standby and sets DPMS Off: 0. Setting > Enable Light Locker On/Off has varying effects depending on the > initial state. Enabling LL after it had been disabled set the Screen > Saver timeout: 600 and DPMS Off: 0. I thought I found a case that set > Screen Saver timeout: 0, but couldn’t duplicate that result. > > An Ad Hoc Presentation Mode: Set XPM systray icon to always appear; > right-click it and choose Mode: Presentation. Set LL monitor-blank > slider to Never and Apply. > > An Ad Hoc Normal Mode: Right-click XPM systray icon and choose Mode: > Normal. Set LL monitor-blank slider to 10 minutes and Apply. > > >
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