Comment 6 for bug 1317701

I am experiencing what sounds like the same symptom, on xubuntu 14.04 - screen blanks after inactivity, even after configuring it to never blank. And it doesn't unblank on activity - it only unblanks when I blindly type my password (apparently the session is locked but the password prompt is not visible).

I was *not* configuring blanking with light-locker-settings (never heard of it before searching for this bug), instead I was using the Xfce power manager (settings -> Power Manager).

I ran the commands you suggested to the orig. reporter, which show that like him, light-locker was running and using the system default config:

pw-xbook ~:$ grep Exec ~/.config/autostart/light-locker.desktop
grep: /home/pw/.config/autostart/light-locker.desktop: No such file or directory

pw-xbook ~:$ grep Exec ~/.config/autostart/screensaver-settings.desktop
grep: /home/pw/.config/autostart/screensaver-settings.desktop: No such file or directory

pw-xbook ~:$ ps ux | grep light-locker
pw 2191 0.0 0.1 234552 11184 ? Sl 19:47 0:00 light-locker
pw 3657 0.0 0.0 18936 904 pts/3 S+ 21:33 0:00 grep light-locker

pw-xbook ~:$ xfconf-query -c xfce4-session -l -v | grep Lock

pw-xbook ~:$ xfconf-query -c xfce4-power-manager -l -v | grep "dpms\|lock"
/xfce4-power-manager/dpms-enabled false
/xfce4-power-manager/dpms-on-ac-off 0
/xfce4-power-manager/dpms-on-ac-sleep 0
/xfce4-power-manager/dpms-on-battery-off 0
/xfce4-power-manager/dpms-on-battery-sleep 0
/xfce4-power-manager/dpms-sleep-mode suspend
/xfce4-power-manager/lock-screen-suspend-hibernate false

pw-xbook ~:$ xset q
...
Screen Saver:
  prefer blanking: yes allow exposures: yes
  timeout: 600 cycle: 600
Colors:
  default colormap: 0x22 BlackPixel: 0x0 WhitePixel: 0xffffff
...
DPMS (Energy Star):
  Standby: 600 Suspend: 600 Off: 600
  DPMS is Disabled