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koreader/platform/sony-prstux/suspend.sh

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#!/bin/bash
set -x
# enter sleep, disabling all devices except CPU
echo mem >/sys/power/state
# disable WiFi
./set-wifi.sh off
# set minimum CPU frequency during sleep
echo powersave >/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
# wait for sleep to complete
cat /sys/power/wait_for_fb_sleep