I'm using Fedora 18: xfce4-power-manager-1.2.0-7.fc18.x86_64

I want to screen to never blank. I configured it as follows:

"On AC", "Monitor" tab:
"Put display to sleep when computer is inactive" - never
"Switch off display when computer is inactive" - never

I verified that xfce4-power-manager process is running.

Yet, display blanks (monitor reports no signal) after exactly 10 minutes.

This time period can be changed by "xset s <SECONDS>", and truly disabled by "xset s off".

This is what "xset q" says fresh after boot into xfce:

$ xset q
...
Screen Saver:
  prefer blanking:  yes    allow exposures:  yes
  timeout:  600    cycle:  600
...
DPMS (Energy Star):
  Standby: 600    Suspend: 600    Off: 600
  DPMS is Disabled

Apparently, xfce4-power-manager did not disable screen saver as I would expect it to, and screen saver kicks in.


Another problem: if I lock the screen (Ctrl-Alt-Del), then unlock it, the screen will blank after 10 minutes even if "xset s off" was commanded. "xset q" reveals that after lock/unlock sequence, DPMS gets activated. Now it shows different DPMS state:

DPMS (Energy Star):
  Standby: 600    Suspend: 600    Off: 600
  DPMS is Enabled
  Monitor is On

and I need to additionally run "xset -dmps" to prevent screen blanking.


Possibly relevant version info of other packages:
systemd-197-1.fc18.2.x86_64
xorg-x11-server-Xorg-1.13.3-3.fc18.x86_64
xorg-x11-drv-intel-2.21.12-1.fc18.x86_64
xfce4-power-manager-1.2.0-7.fc18.x86_64