From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v3 2/6] suspend: switch acpi s3 to new
	infrastructure.
Date: Thu, 09 Feb 2012 12:17:33 +0100
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To: Gerd Hoffmann <kraxel@redhat.com>
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On 02/08/2012 12:00 PM, Gerd Hoffmann wrote:
> +/* set CMOS shutdown status register (index 0xF) as S3_resume(0xFE)
> +   BIOS will read it and start S3 resume at POST Entry */
> +static void rtc_notify_suspend(Notifier *notifier, void *data)
> +{
> +    RTCState *s = container_of(notifier, RTCState, suspend_notifier);
> +    rtc_set_memory(&s->dev, 0xF, 0xFE);
> +}
> +

Out of curiosity, who would set this on real hardware?  And since RTC 
memory is nvram, what happens if I remove the mains plug while the 
system is in S3?

Paolo