Power Manager overrides screensaver blanktime even if display management is disabled

Even if "Display power management" is disabled, Power Manager changes the xorg blanktime property to whatever value is set on the configuration tab.

This means enabling the screen saver if the blanktime was previously set to zero to disable it. (e.g. xset s off)

The undesired effect seems to be activated by the following function call stack: XSetScreenSaver() called from xfpm_update_blank_time() called from xfpm_power_check_power() called from xfpm_power_get_properties()

Somewhere in this chain there should be a check whether Power Manager is set to manage the display.

The workaround is to enable "Display power management", set all timers to zero and disable it back.