[Xen-bugs] [Bug 1453] New: [ACPI] On some x86_64 platform, `echo mem > /sys/power/state` can not trigger Dom0 S3 until using Ctrl^C to terminate the command.

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1453

           Summary: [ACPI] On some x86_64 platform, `echo mem >
                    /sys/power/state` can not trigger Dom0 S3 until using
                    Ctrl^C to terminate the command.
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: haicheng.li@xxxxxxxxx


Xen changeset info:
xen-changeset:   19534:120d3c67951b
dom0-changeset:   861:366c31f3ab4b

ioemu git:
commit 2ed2ee1704a4ef956ecc61848c84d12aaa4419d5
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Fri Apr 3 16:17:22 2009 +0100

On some platform, with ia32e xen, echo mem into /sys/power/state can not make
system into S3. We need to Ctrl^C or terminate the echo process, then system
will enter S3. 

On the same machine, PAE Xen can do Dom0 S3 without any issue.

Reproduce steps:

Run following script in dom0:

#!/bin/sh
set -x
time=5
i=0
while [ $i -lt $time ];
do
        # For kernel beyond 2.6.22
        #echo 0 > /sys/class/rtc/rtc0/wakealarm
        #echo `date '+%s' -d '+ 20 sec'` > /sys/class/rtc/rtc0/wakealarm
        # Another syntax
        #echo +20 > /sys/class/rtc/rtc0/wakealarm

        # For kernel below 2.6.22
        echo +0000-00-00 00:00:25 > /proc/acpi/alarm

        echo mem > /sys/power/state

        # Some machine may need vtetool to resume video display
        #vbetool post
        sync
        echo $i > /tmp/S3_log
        sync
        ((i=i+1))
done


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