Ubuntu 24.04环境下的挂起转休眠

       使用systemd的sleep钩子实现的电源管理脚本，合盖首先是挂起，5分钟检查电源状态如果是电池供电则进行休眠，否则还是挂起。系统需已经支持休眠，可执行systemctl hibernate查看休眠是否已启用。

       脚本如下，需放到/usr/lib/systemd/system-sleep下，并有执行权限。

#!/bin/bashLOG_FILE="/tmp/smart-suspend.log"
WAKEUP_TIME_FILE="/var/run/suspend-wakeup-time"
SUSPEND_MODE_FILE="/var/run/suspend-mode"# 确保日志文件可写入
touch "$LOG_FILE"
chmod 644 "$LOG_FILE"echo "==========================================" >> "$LOG_FILE"
echo "$(date): systemd-sleep hook: $1 $2" >> "$LOG_FILE"# 函数：检查是否是RTC唤醒
is_rtc_wakeup() {# shell function return 0 is true 1 is false# 检查alarm_IRQ状态if [ -f "/proc/driver/rtc" ]; thenRTC_INFO=$(cat /proc/driver/rtc)ALARM_IRQ=$(echo "$RTC_INFO" | grep -oP 'alarm_IRQ\s*:\s*\K(yes|no|true|false|[01])')echo "$(date): Raw alarm_IRQ value: '$ALARM_IRQ'" >> "$LOG_FILE"case "$ALARM_IRQ" inyes|true|1)echo "$(date): Detected RTC wakeup (alarm_IRQ positive)" >> "$LOG_FILE"return 1;;no|false|0)echo "$(date): No RTC wakeup (alarm_IRQ negative)" >> "$LOG_FILE"return 0;;*)echo "$(date): Unknown alarm_IRQ format: '$ALARM_IRQ'" >> "$LOG_FILE"return 0;;esacfi# 备用检查方法if [ -f "/sys/class/rtc/rtc0/device/power/wakeup" ]; thenWAKEUP_STATUS=$(cat "/sys/class/rtc/rtc0/device/power/wakeup")if [ "$WAKEUP_STATUS" = "enabled" ]; thenecho "$(date): Fallback check: RTC wakeup enabled" >> "$LOG_FILE"return 1fifireturn 0
}case "$1" inpre)# 挂起之前执行if [ "$2" = "suspend" ]; then# 检查是否需要设置RTC唤醒if [ ! -f "$SUSPEND_MODE_FILE" ]; thenecho "$(date): First suspend - setting RTC wakeup in 5 minutes" >> "$LOG_FILE"echo "rtc_wakeup" > "$SUSPEND_MODE_FILE"# 设置RTC唤醒（5分钟后）WAKEUP_TIME=$(($(date +%s) + 300))echo "$WAKEUP_TIME" > "$WAKEUP_TIME_FILE"rtcwake -m no -s 300echo "$(date): RTC wakeup scheduled at $(date -d @$WAKEUP_TIME)" >> "$LOG_FILE"elseecho "$(date): Continuing suspend without RTC wakeup" >> "$LOG_FILE"# 这是继续挂起，不设置RTC唤醒fifi;;post)# 恢复之后执行if [ "$2" = "suspend" ]; thenecho "$(date): Resumed from suspend" >> "$LOG_FILE"# 等待系统稳定sleep 2# 检查唤醒原因IS_RTC_WAKEUP=falseif is_rtc_wakeup; thenIS_RTC_WAKEUP=trueecho "$(date): Confirmed RTC wakeup" >> "$LOG_FILE"elseecho "$(date): Not RTC wakeup (likely user wakeup)" >> "$LOG_FILE"fi  if [ -f "$SUSPEND_MODE_FILE" ] && [ -f "$WAKEUP_TIME_FILE" ]; thenSUSPEND_MODE=$(cat "$SUSPEND_MODE_FILE")SCHEDULED_TIME=$(cat "$WAKEUP_TIME_FILE")CURRENT_TIME=$(date +%s)TIME_DIFF=$((CURRENT_TIME - SCHEDULED_TIME))echo "$(date): Scheduled: $(date -d @$SCHEDULED_TIME), Current: $(date -d @$CURRENT_TIME)" >> "$LOG_FILE"echo "$(date): Time difference: $TIME_DIFF seconds" >> "$LOG_FILE"echo "$(date): RTC wakeup detected: $IS_RTC_WAKEUP" >> "$LOG_FILE"# 判断是否是RTC定时唤醒if [ "$TIME_DIFF" -ge -30 ] && [ "$TIME_DIFF" -le 30 ] && $IS_RTC_WAKEUP; thenecho "$(date): Woke up by RTC timer" >> "$LOG_FILE"# 检查当前电源状态if on_ac_power; thenecho "$(date): On AC power - preparing to resume suspend" >> "$LOG_FILE"# 修改挂起模式标记，表示这是继续挂起echo "continue_suspend" > "$SUSPEND_MODE_FILE"# 清除RTC时间文件但保留模式标记rm -f "$WAKEUP_TIME_FILE"# 使用正确的时间格式echo "$(date): Resuming suspend without RTC" >> "$LOG_FILE"echo "systemctl suspend" | at now + 0 min 2>/dev/nullelseecho "$(date): On battery power - switching to hibernate" >> "$LOG_FILE"# 清除所有状态rm -f "$SUSPEND_MODE_FILE" "$WAKEUP_TIME_FILE"# 转为休眠echo "systemctl hibernate" | at now + 0 min 2>/dev/nullfielseecho "$(date): Woke up by user (not RTC timer) - cleaning up" >> "$LOG_FILE"# 用户提前唤醒，清除所有状态rm -f "$SUSPEND_MODE_FILE" "$WAKEUP_TIME_FILE"rtcwake -m disablefielseecho "$(date): Normal resume or state inconsistent - cleaning up" >> "$LOG_FILE"rm -f "$SUSPEND_MODE_FILE" "$WAKEUP_TIME_FILE"fifi;;
esacecho "$(date): systemd-sleep hook completed" >> "$LOG_FILE"