Tis article provides the meaning and description of S4/S5 RTC Wake

S4/S5 RTC Wake refers to the capability of a computer to automatically power on from either the S4 (Hibernate) or S5 (Shutdown) states at a scheduled time, based on the system’s RTC (Real-Time Clock) settings.

Here’s a breakdown:

1. S4 (Hibernate) RTC Wake:

   • In S4 (Hibernate), the system saves the session state to the disk and powers off most hardware components. When RTC Wake is enabled, the system can be programmed to "wake" from hibernation at a specific time, restoring the session from disk.

2. S5 (Shutdown) RTC Wake:

   • In S5 (Shutdown), the system is completely powered down, and no session is saved. RTC Wake allows the computer to power on automatically from a full shutdown state, like an alarm clock function, using only the RTC.

3. Usage:

   • S4/S5 RTC Wake is helpful for automating tasks, such as booting the computer to run updates, backups, or other scheduled tasks without manual intervention.

4. Enabling S4/S5 RTC Wake:

   • This option can typically be found in the BIOS settings under Power Management or Wake settings, often named "Wake by RTC" or "RTC Alarm."
   • You’ll usually set the date and time to define when the computer should wake.

By enabling S4/S5 RTC Wake, you can save power while still scheduling the system to wake up automatically, even from deep power-off states.