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USB Standby Power at S4 and S5 refers to the power state of a USB port when a computer is in the S4 (Hibernate) or S5 (Shutdown) power states.
In the S4 power state (Hibernate), the computer saves the current system state to the hard drive and then shuts down completely. In this state, the USB port may still provide power to connected devices, allowing them to charge or maintain a small level of functionality.
In the S5 power state (Shutdown), the computer is completely turned off, and the USB port does not provide any power to connected devices.