Message-ID: <47BF071C.6040308@rtr.ca>
Date: Fri, 22 Feb 2008 12:32:12 -0500
From: Mark Lord <lkml@rtr.ca>
Organization: Real-Time Remedies Inc.
User-Agent: Thunderbird 2.0.0.9 (X11/20071031)
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To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: david@lang.hm, Linus Torvalds <torvalds@linux-foundation.org>,
       Jesse Barnes <jesse.barnes@intel.com>,
       Jeff Chua <jeff.chua.linux@gmail.com>,
       lkml <linux-kernel@vger.kernel.org>, Dave Airlie <airlied@linux.ie>,
       linux-acpi@vger.kernel.org, Greg KH <gregkh@suse.de>
Subject: Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk.
 Screen becomes green.
References: <Pine.LNX.4.64.0802210101050.3576@boston.corp.fedex.com> <alpine.LFD.1.00.0802210819560.1777@xo-0C-FC-0F.localdomain> <47BEFEC4.7090904@rtr.ca> <200802221802.18640.rjw@sisk.pl>
In-Reply-To: <200802221802.18640.rjw@sisk.pl>
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Rafael J. Wysocki wrote:
> On Friday, 22 of February 2008, Mark Lord wrote:
>> david@lang.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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