不要忘记chmod + x该文件，使其可执行。
还有一个没有rtcwake的解决方案，在/ sys / class / rtc / rtc0中使用了akealarm。＃注释之后，请在pm-functions（/ usr / lib / pm-utils）中使用过时的代码，因为内核不直接支持...，（'cos当前内核（在3.6之后）直接支持）。还原该代码，并放入do_suspend（）部分而不是do_suspend_hybrid（）。
过时的代码（调用suspend_hybrid时，挂起然后休眠）：
# since the kernel does not directly support hybrid sleep, we do
# something else -- suspend and schedule an alarm to go into
# hibernate if we have slept long enough.
# Only do this if we do not need to do any special video hackery on resume
# from hibernate, though.
if [ -z "$SUSPEND_HYBRID_MODULE" -a -w "$PM_RTC/wakealarm" ] && \
check_suspend && check_hibernate && ! is_set $HIBERNATE_RESUME_POST_VIDEO; \
then
SUSPEND_HYBRID_MODULE="kernel"
do_suspend_hybrid() {
WAKETIME=$(( $(cat "$PM_RTC/since_epoch") + PM_HIBERNATE_DELAY))
echo >"$PM_RTC/wakealarm"
echo $WAKETIME > "$PM_RTC/wakealarm"
if do_suspend; then
NOW=$(cat "$PM_RTC/since_epoch")
if [ "$NOW" -ge "$WAKETIME" -a "$NOW" -lt $((WAKETIME + 30)) ]; then
log "Woken by RTC alarm, hibernating."
# if hibernate fails for any reason, go back to suspend.
do_hibernate || do_suspend
else
echo > "$PM_RTC/wakealarm"
fi
else
# if we cannot suspend, just try to hibernate.
do_hibernate
fi
}
fi
推荐的。使用uswsusp更容易，而同时最大化s2both的好处，即挂起时s2both。将还原后的代码放入uswsusp模块（/usr/lib/pm-utils/module.d）的do_suspend（）部分。
恢复的代码（调用suspend时的suspend_hybrid）：
WAKETIME=$(( $(cat "$PM_RTC/since_epoch") + PM_HIBERNATE_DELAY))
echo >"$PM_RTC/wakealarm"
echo $WAKETIME > "$PM_RTC/wakealarm"
if do_suspend_hybrid; then
NOW=$(cat "$PM_RTC/since_epoch")
if [ "$NOW" -ge "$WAKETIME" -a "$NOW" -lt $((WAKETIME + 30)) ]; then
log "Woken by RTC alarm, hibernating."
# if hibernate fails for any reason, go back to suspend_hybrid.
do_hibernate || do_suspend_hybrid
else
echo > "$PM_RTC/wakealarm"
fi
else
# when do_suspend is being called, convert to suspend_hybrid.
do_suspend_hybrid
fi
使用uswsusp，我们可以看到挂起/休眠的进度以及文本中显示的反向过程，甚至我们可以通过按退格键中止它。如果没有uswsusp，则挂起/休眠只会烦人地消失-烦人，特别是在唤醒唤醒警报并执行休眠状态时（uswsusp中的s2disk）。在pm-functions文件中的通常位置设置休眠之前的睡眠时间。
# variables to handle hibernate after suspend support
PM_HIBERNATE_DELAY=900 # 15 minutes
PM_RTC=/sys/class/rtc/rtc0
这是uswsusp mod ：（请记住，该模块是从pm函数调用的，因此插入的变量相同）
#!/bin/sh
# disable processing of 90chvt and 99video.
# s2ram and s2disk handle all this stuff internally.
uswsusp_hooks()
{
disablehook 99video "disabled by uswsusp"
}
# Since we disabled 99video, we need to take responsibility for proper
# quirk handling. s2ram handles all common video quirks internally,
# so all we have to do is translate the HAL standard options to s2ram options.
uswsusp_get_quirks()
{
OPTS=""
ACPI_SLEEP=0
for opt in $PM_CMDLINE; do
case "${opt##--quirk-}" in # just quirks, please
dpms-on) ;; # no-op
dpms-suspend) ;; # no-op
radeon-off) OPTS="$OPTS --radeontool" ;;
reset-brightness) ;; # no-op
s3-bios) ACPI_SLEEP=$(($ACPI_SLEEP + 1)) ;;
s3-mode) ACPI_SLEEP=$(($ACPI_SLEEP + 2)) ;;
vbe-post) OPTS="$OPTS --vbe_post" ;;
vbemode-restore) OPTS="$OPTS --vbe_mode" ;;
vbestate-restore) OPTS="$OPTS --vbe_save" ;;
vga-mode-3) ;; # no-op
save-pci) OPTS="$OPTS --pci_save" ;;
none) QUIRK_NONE="true" ;;
*) continue ;;
esac
done
[ $ACPI_SLEEP -ne 0 ] && OPTS="$OPTS --acpi_sleep $ACPI_SLEEP"
# if we were told to ignore quirks, do so.
# This is arguably not the best way to do things, but...
[ "$QUIRK_NONE" = "true" ] && OPTS=""
}
# Since we disabled 99video, we also need to handle displaying
# help info for the quirks we handle.
uswsusp_help()
{
echo # first echo makes it look nicer.
echo "s2ram video quirk handler options:"
echo
echo " --quirk-radeon-off"
echo " --quirk-s3-bios"
echo " --quirk-s3-mode"
echo " --quirk-vbe-post"
echo " --quirk-vbemode-restore"
echo " --quirk-vbestate-restore"
echo " --quirk-save-pci"
echo " --quirk-none"
}
# This idiom is used for all sleep methods. Only declare the actual
# do_ method if:
# 1: some other sleep module has not already done so, and
# 2: this sleep method can actually work on this system.
#
# For suspend, if SUSPEND_MODULE is set then something else has already
# implemented do_suspend. We could just check to see of do_suspend was
# already declared using command_exists, but using a dedicated environment
# variable makes it easier to debug when we have to know what sleep module
# ended up claiming ownership of a given sleep method.
if [ -z "$SUSPEND_MODULE" ] && command_exists s2ram && \
( grep -q mem /sys/power/state || \
( [ -c /dev/pmu ] && check_suspend_pmu; ); ); then
SUSPEND_MODULE="uswsusp"
do_suspend()
{
WAKETIME=$(( $(cat "$PM_RTC/since_epoch") + PM_HIBERNATE_DELAY))
echo >"$PM_RTC/wakealarm"
echo $WAKETIME > "$PM_RTC/wakealarm"
if do_suspend_hybrid; then
NOW=$(cat "$PM_RTC/since_epoch")
if [ "$NOW" -ge "$WAKETIME" -a "$NOW" -lt $((WAKETIME + 30)) ]; then
log "Woken by RTC alarm, hibernating."
# if hibernate fails for any reason, go back to suspend_hybrid.
do_hibernate || do_suspend_hybrid
else
echo > "$PM_RTC/wakealarm"
fi
else
# when do_suspend is being called, convert to suspend_hybrid.
do_suspend_hybrid
fi
}
fi
if [ -z "$HIBERNATE_MODULE" ] && \
[ -f /sys/power/disk ] && \
grep -q disk /sys/power/state && \
[ -c /dev/snapshot ] &&
command_exists s2disk; then
HIBERNATE_MODULE="uswsusp"
do_hibernate()
{
s2disk
}
fi
if [ -z "$SUSPEND_HYBRID_MODULE" ] &&
grep -q mem /sys/power/state && \
command_exists s2both && \
check_hibernate; then
SUSPEND_HYBRID_MODULE="uswsusp"
do_suspend_hybrid()
{
uswsusp_get_quirks
s2both --force $OPTS
}
if [ "$METHOD" = "suspend_hybrid" ]; then
add_before_hooks uswsusp_hooks
add_module_help uswsusp_help
fi
fi