The Linux power management mechanism distinguishes between three sleep states: Standby, Suspend-to-RAM (STR) and hibernation. They have increasing energy saving and wake up latency, although in practise STR saves more energy and has very similar wake up latency as the Standby mode. STR needs to be supported by the platform hardware. Main memory needs to be refreshed to preserve [...]
1) Kernel command line arguments Add 'init=/bin/bash no_console_suspend' to boot to a basic shell and keep the console output while the suspend is happening. 2) Mount proc and sys: mount -t proc /proc proc mount -t sysfs /sys sys 3) Prepare the wake up source: Any wake up source is valid, like a GPIO: echo [...]
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