+++ This bug was initially created as a clone of Bug #554247 +++

Please describe the problem:
Using Ubuntu 8.04.1 (up to date)
I have a dual-monitor setup and in the past I was using "Separate X-Sessions" for each monitor. I recently switched to "TwinView" and now my monitors won't go into sleep (power saving) state. I've tried changing the settings in System>Power Management>Display> "Put display to sleep when inactive for" but no matter what I set it to (for a time limit) it NEVER goes into sleep mode. I've left the computer on for hours on end, and they never go into sleep. But when I switch from "TwinView" to "Separate X-Screens" the monitors go to sleep right on time, EVERYTIME.

So something is wrong with TwinView. I am fairly new to the Linux and Ubuntu community, so I don't know how to self-diagnose this issue, but if someone can point me in the right direction I don't mind posting log files etc.
Thanks,
-BassKozz

p.s. I am NOT using Compiz (don't know if that makes a difference or not).
System>Preferences>Appearance>Visual Effects = NONE.

Steps to reproduce:
1. Setup a Dual-Monitors in TwinView mode
2. Set the gnome-power-manager to put the displays in sleep after x amount of time
3. Wait to see if the displays are put to sleep


Actual results:
The monitors DO NOT go to sleep as they should

Expected results:
The monitors should go to sleep

Does this happen every time?
Yes, everytime when in TwinView mode... yet it works when in "Separate X-Screen" mode

Other information: