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This is done via the "alarm" registers in the RTC (real-time clock). On the original PC-AT, this chip was a Motorola MC146818. Before going to sleep (ACPI S3), the kernel will program the next-scheduled wake-up time into the "alarm" registers on the RTC, which is always powered-on. When this wake-up time arrives, the RTC will trigger the chipset to ...

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