How does fast user switching know which energy settings to use?

When using fast user switching and keeping 2 accounts logged in, which accounts' energy settings take priority (assuming their settings don't match)? For example, let's say I set my account's display to sleep after 15 minutes and my wife sets hers for 30 minutes. If we both keep our accounts logged in and then leave the Mac on the login screen, who wins?
The reason I ask is because my display won't stay asleep. Unlike my example above, I've made sure both accounts have identical energy settings (sleep the display after 15 minutes & the iMac itself is set to 'never sleep'). I can get it to sleep (usually by pressing control-shift-eject), but it will not stay asleep. I don't think any applications are causing this (I've shut down all apps to test - only Time Machine is scheduled to run automatically). I'm starting to wonder if fast user switching could be the cause? I usually keep both accounts logged in at all times and return to the login screen before heading to bed. I then force the display to sleep with control-shift-eject, but several hours later I wake up to a bright room because the display has turned on again. I haven't tried turning off fast user switching yet, but I can see where that might confuse the OS?
Oh, I've also disabled waking on bluetooth activity just in case my wireless mighty mouse was losing its connection & waking the display upon reconnection - no luck.
Any thoughts or suggestions are appreciated - it's driving me nuts, especially since I can't just turn off the iMac display itself without powering down the entire system.

Energy Saver settings are system-wide and not specific to the user. If one user changes the settings, it's changed for everyone. Screensaver settings are user-specific.
That said, the reason that the system wakes by itself can be one of several things: the system is set to wake up (you can set this under energy saver) by preferences or some application/service, the system receives a wake-up message from something on the network (you can configure this under Security, I believe, or Network, I don't recall), or you have "chatter" related to a device plugged into your computer.
"chatter" is when a USB device or FireWire device sends a signal to the computer it's connected to. Normally, peripherals are quiet if not actively in use, but some things (cheap USB hubs, certain mice, etc) will spuriously send a signal to the connected computer and cause it to wake.

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Edited by: jaybytez on Jun 13, 2008 5:35 PM
Edited by: jaybytez on Jun 13, 2008 5:36 PM

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I've been alternating between banging my head against a wall and reading every forum I could find to try and get a reasonable compromise between using "Fast user switching" and sharing a folder from a file server. It baffles me how the network share/mount model of OSX/AFP is completely killed by fast-user-switching; this is a big problem with Apple requiring users to be actively logged in to share music/video from iTunes which therefore essentially requires fast-user-switching if anyone else wants to use the computer. (anyone find it odd that you can share files without being logged in, but sharing songs requires an active login for each user who is sharing? Apple: time to make iTunes sharing a service!)
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THAT'S IT. Three lines in three files.
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I have a headless G4 Cube running 10.5.8 with a 2TB firewire drive plugged in for storage accessable to any of my macs here at home. I can access it fine with my 2 desktops over ethernet and wirelessly. Recently we decided to consolidate our 2 desktops into one using the muliple users feature. Seems to work fine, and both accounts can access the shared drive. They are logging in with the cube's admin credentials, and the shared drive is set to ignore permissions. I have the drive set to mount on login with a startup item in the system login items prefs. As long as I logout before switching users, everything is good.
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I've not had any luck with the suggestions in the link either.
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1. Creating a new share point on the cube itself so that one user can mount it as a different volume. Then the issue is that I still don't have a volume named "Jukebox" available to each user when switching. I DO have access now to the data from both accounts, but under 2 different mount points (volume names) and the xml file for iTunes is hard coded with the path for each mp3 including the "Jukebox" volume name... so no go.
2. Tried figuring out a way I could script a mounting of the share with the terminal thinking I could then run that shell script at startup. Can't seem to get the sytax right. If I create a directory in /Volumes and mount and afp share to it, it takes on the ownership of root/wheel which I can't access in the finder and can't seem to change.
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ITunes with fast user switching.

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I have searched through the discussions here and every mention I've found that seems to reference this issue also references using network home directories, which we are not doing. I have the home directory set to continue to reside on the local machine so the AFP/NFS issue shouldn't apply.
Prior to implementing OS X Server, the only thing we were unable to do was limit external drive use and writable media on the Macs since they don't recognize those GPOs from the domain controller. Updates were easily handled through a third party appliance that we already use for all our other devices and computers on the network. At this point, if fast user switching is unavailable, it would be less work and less inconvenient for me to simply limit the external media use locally and allow the Mac to be locked by removing the influence of OS X Server.
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Hi all I'm having a bit of a problem that I hope someone can help me with. First the details, I have a MBP bought in late '07 and running Tiger. I was doing full backups using "Backup" and I also had Safari, iTunes, and Word open. I briefly switched to my other account using fast user switching and when I returned to the original account the whole screen had a blue tint to it. Like the color profile was off. This has happened before and a restart usually cures it, I haven't restarted yet but I am fairly certain it will correct the problem this time too. But is there anyway to prevent this? My second question is the one I'm more worried about. It also has happened before but usually when using more CPU intensive applications. When I went to System Preferences and opened up the display preferences in an attempt to correct the previous problem I heard a very loud tone. Like some type of warning tone, it was loud enough that it startled me. I had iTunes playing and after the tone the music got very quiet but relaunching it brought it back to normal. I'm just wondering is this some type of warning tone? Is it something I should be concerned about? Besides the music everything else seemed unaffected, although the previous times that this has happened usually when using handbrake there was noticeable problems after the tone (like applications crashing). All of these problems are gone after the computer is restarted though. Does anyone have any insight on these issues? Thank you.
-James

OK I ran TechTool and everything passed except for the volume scan. Then I checked this with Disk Utility and the HD failed for a few minor reasons, like invalid block count. I repaired it using the fsck -fy command in single user mode. The computer seems a little faster now. I don't know if this error is related to the beep in any way, I may try talking to an Apple genius to see if they know. Since it seems like pretty minor errors I'm not too worried about it but it does seem to be happening often. The last time I had this error was when I posted a question here about it which I just checked was on March 1st. So this error happened again after a little more than 2 weeks which seems excessive to me. Any thoughts?

How does fast user switching know which energy settings to use?

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