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Since upgrading my hardware (mobo, CPU and memory) a couple months ago my computer no longer automatically suspends and hibernates after the configured idle periods. Both functions work just fine manually, but if I leave the computer on overnight it's still active the next morning even though it's configured to sleep after 3 hours and hibernate after 6 hours.
The system is:
Mobo : MSI 790GX-G65
CPU : AMD Phenom II 965 BE at 3.4 GHz
Memory : Corsair DDR3 1600, at 1333 MHz and 9-9-9-21
HDDs : 1 EIDE (System - O/S, Programs, etc), 2 SATA in RAID-0 (Data)
DVD : 1 LITE-ON DVDRW SOHW-1673S
Card Reader: 1 multi-card reader
O/S : Windows XP Pro SP3
Keyboard is attached via PS2 and mouse is USB.
How do I diagnose the cause of this?
EDIT: 2010-07-22
Since it seems most likely that this is an application or service resetting the idle counter, does anyone know how to observe and/or track this counter?
EDIT: 2010-07-28
Some testing shows that it automatically suspends up to 30 minutes, but not when set to 3 hours. Or perhaps it suspends only when Admin is logged on. Or perhaps it depends on which account is left active.
Memory was thoroughly and exhaustively tested as part of the hardware build and BIOS tweaking. The files on remote computers could be a lead, since I do work off a VPN, though I normally disconnect the VPN, I do routinely leave the remote drives mapped. – Lawrence Dol – 2010-07-14T18:10:33.650
I have eliminated having networked drives mapped and having the VPN open as possible causes, by ensure that neither was true and having the system still fail to sleep on schedule. Maybe I need to figure out how to force feed the computer some Lunesta? – Lawrence Dol – 2010-07-22T14:18:22.550