Where is xorg DPMS currently set

[T o n g <mlist4suntong@yahoo.com>]

Hi, 

The xorg uses to honour the DPMS settings from xorg.conf or xset. 

Now my xset DPMS settings is constantly get cleared -- less that 5 
minutes later after I set DPMS via xset, the settings are zero'd out:

$ xset -q | grep -A1 DPMS
DPMS (Energy Star):
  Standby: 0    Suspend: 0    Off: 0
  DPMS is Enabled
  Monitor is On

Yet, my monitor can still go to blank and power saving mode. 

Where is xorg DPMS currently configured?

I want to customize the time it takes to go Standby, Suspend, & Off. 
And/or I want to be able to disable it entirely. 

Thanks