Question about PC Laptops
Sony laptops are infamous for these kinds of problems. You very likely have another Sony program running in the system tray which is trying to control all power functions in a "smart" (in other words, defective) manner, and this is conflicting with and resetting your OS's normal power settings. Try to find this program on your laptop and run it and check what it thinks it is doing. You might also have a problem with the actually writing of the hibernation file on your machine due to any number of problems (low disk space, conflicting file names, corrupted administraive priveledges for whatever program thinks it is doing the writing). I'd suggest uninstalling the SONY power management software and then using the stuff the operating system provides. It might not be good, but it at least works kind of, and consistently.
The changing status of the hibernate settings you describe suggest to me that another program is changing them to try to be "efficient".
Last resort - disable hibernate; it doesn't work very well on Sony laptops even at the best of times.
Posted on Nov 16, 2007
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