ThinkPad does not go into hibernation via timer when in standby - ThinkPad R60, R61, T60, T61, X60, X60 Tablet, X61, X61 Tablet, Z60, Z61, R400, R500, SL series, T400, T500, X200, X200 Tablet, X300, X301, W500, W700
When in standby on battery power, the ThinkPad will not enter hibernation mode automatically via the timer. If, for example, on battery power, you have your ThinkPad set to suspend in 5 minutes and hibernation after 15 minutes, the machine will enter standby at 5 minutes but will not enter hibernation after 15.
Any of the following ThinkPad systems running the Windows Vista and XP operating system :
ThinkPad X60 Tablet
ThinkPad X61 Tablet
ThinkPad SL series
ThinkPad X200 Tablet
This is normal behavior. When entering hibernation, the contents of system memory are written to a file on the hard drive. The size of this file will approximately equal the amount of installed memory on the machine and it may take over a minute to write this data to the drive. If the ThinkPad were being carried while in standby and the hibernation timer became active, the drive could be written to while the system is being jostled.
Active Protection can guard against this but could also prevent the system from entering hibernation. If you prefer to have your ThinkPad go into hibernation on battery, rather than standby, set the hibernation timer to a lower value than the standby timer.