linux-kernel - Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

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Message-ID: <47BF071C.6040308@rtr.ca>
Date:	Fri, 22 Feb 2008 12:32:12 -0500
From:	Mark Lord <lkml@....ca>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	david@...g.hm, Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...ux.ie>, linux-acpi@...r.kernel.org,
	Greg KH <gregkh@...e.de>
Subject: Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk.
 Screen becomes green.

Rafael J. Wysocki wrote:
> On Friday, 22 of February 2008, Mark Lord wrote:
>> david@...g.hm wrote:
>> ..
>>> I've been watching for kexec hibernate for a little while now, and the 
>>> last I saw was that acpi was incompatible with the kexec hibernate (but 
>>> the suspend folks were still claiming that devices needed to be put in 
>>> the 'right mode' not just powered off. I've been waiting to see this 
>>> resolved.
>> ..
>>
>> Yeah, exactly.  What's so special about poweroff on hibernation?
>> Why even bother with the special "S4" state there?
> 
> (1) To be able to wake up with the help of devices that can't wake
>     the system up from S5 (power off)
> (2) To handle some platform devices appropriately over the cycle
..

That's the theory.  I've read about it, but have yet to imagine
any real-life situation where it applies.

But this isn't my speciality, so.. do you have experience with any real examples?

Thanks!

>> I want a real full poweroff, or at least I think I do.  Why wouldn't I?
>>
>> ????
> 
> You may want that, some people may not want it.
> 
> We are supposed to handle S4, the BIOS/platform may expect us to do that, so
> IMO this is a good enough reason to do it.  Especially that we can.
> 
> Thanks,
> Rafael

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