Re: ACPI wake up event (alarm)

["Dino Klein" <zagzag-lists-zY4eFNvK5D9If6P1QZMOBw@public.gmane.org>]

According to the specs the RTC must be able to wakeup a system from S1, S2, or S3, S4 is optional, and S5 is not even considered a sleep state, so the RTC is not required to support S5. (check ACPI 2.0c, section 4.7.2.4, and table 5-9)
Even still, the chipset might support it, as my Via 686B which treats S4 & S5 the same way.

This is just a guess, but perhaps the handling of the wakeup bits in the linux ACPI is inconsistent, so when you transition to S1, it does allow for a wakeup from the RTC, and then doesn't clear it before entering S5 (as specified in the footnote). However, when you go directly to S5, the RTC is not set as wakup source, and that's why it doesn't work.
If S3 or S4 work for you, then perhaps you should use them, thus avoiding this whole issue.

One sidenote - are you unmounting the filesystems before putting the machine to S5? after all, that's the equivalent of pressing the power button.




> -----Original Message-----
> From: Jarek Zuk [mailto:j.zuk-QYlicCNJNu5TzFIbWlesCw@public.gmane.org]
> Sent: Thursday, April 15, 2004 12:48 PM
> To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Subject: [ACPI] ACPI wake up event (alarm)
>
>
> I have a question about ACPI alarm (/proc/acpi/alarm).
>
> I have a cron job  that runs early in the morning, so I need my machine to be up at that time.
> I dont want to have it up all night, so I want to use the alarm feature.
>
> I use kernel 2.4.25 with your corresponding patch. I read everything on acpi page about
> /proc/acpi/sleep and /proc/acpi/alarm .
> What I want to do is :
> echo 2004-04-15 14:40:00 > /proc/acpi/alarm
> echo 5 > /proc/acpi/sleep
>
> and get the computer up when the specified time comes.
>
> My problem is that it works  sometimes, well what I noticed is that it works providing that
> before I put the system into sleep mode (5)  I do :
> echo 1 > /proc/acpi/sleep
> (the power button starts blinking)
> press the button  ( system is awake )
>
> When I  dont do this  "echo 1 > /proc/acpi/sleep" thing , the computer doesn't  turn on
> whet time comes. :(
>
> Looks like putting system into a sleep mode 1 changes something that allows later to
> do proper wakeup.
>
> Does the system have to be in sleep mode to be woken up by alarm event ? or it should work
> also after shutdown ?
>
> I want to have this procedure in a script and presing the power button  is kinda difficult from a
> script.
>
> Any pointers are welcome.
> Jarek Zuk
>
>
>
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