Linux/ACPI - Documentation: The file /sys/power/state || /proc/acpi/sleepWarning: /proc/acpi is being replaced by interfaces in /sys and new software should not look in /proc. To conserve energy while remaining quickly available, ACPI-compatible PCs may enter system sleep states. The ACPI specification defines 5 of these states, known as S-states. Unlike the processor sleep states described later, no work is done by the system under S-states. Each state introduces grea
