acpi.txt

==================================acpi==================================
1.suspend guest to disk.
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winux: # pm-hibernate / # echo disk >/sys/power/state
windows: need enable S4 via "# powercfg -h on"
winxp/2k3/win7: click "start" button and select "hibernate" in the menu.
win2k8: control Panel -> power option -> "choose what the power button does" -> select "hibernate" ->  click "save changes" button.
resume host via pressing power button.

2.suspend guest to mem.
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linux: # pm-suspend / # echo mem >/sys/power/state
windows: click Star -> standby (or sleep/suspend).
for windows 2k8 guest: please check the "suspend to disk" case to find how to do s3/s4 for 2k8 guest.
resume host via pressing power button.

3.resume VM from s3 as a response for monitor/keyboard/mouse action/RTC alarm.
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(1)Press the keyboard.
(2)Send "system_wakeup" qemu command.
(3)Click the mouse in the guest. (Need to use the PS/2 mouse, USB mouse is not supported.)
(4)RTC to wakeup guest:
 take linux guest for example:  # rtcwake  -m mem -t 20s (Guest will wakeup automatically after 20s)
 for windows guest: "start" -> "control-panel" -> "System and Security" -> "Administrative Tools"-> "Task Scheduler". Select "Create Task..." and create a task as following:
 1)in the "General" tab, fill in "Name" and "Description", check "Run with highest privileges".
 2)in the "Action" tab, new a action with "Display a message".
 3)in the "Conditions" tab check "Wake the computer to run this task".
 4)in the "Triggers" tab, new a trigger, set one time and select "enabled". 

4.enable S3/S4 by adding the following commands:
...-global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0

5.Repeat do S3 for 20 times.
# for i in $( seq 1 20 ); do rtcwake -m mem -s 5; sleep 5; done
suspend guest to memory inside guest and wakeup it after 5 minutes.
# rtcwake -m mem -s 300