linux-kernel - Re: Documentation on /sys/power/resume

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Message-ID: <465984E5.10506@tmr.com>
Date:	Sun, 27 May 2007 09:17:25 -0400
From:	Bill Davidsen <davidsen@....com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Linux Kernel M/L <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: Documentation on /sys/power/resume

Rafael J. Wysocki wrote:
> On Sunday, 27 May 2007 14:53, Bill Davidsen wrote:
>   
>> Rafael J. Wysocki wrote:
>>     
>>> Hi,
>>>
>>> On Sunday, 27 May 2007 01:51, Bill Davidsen wrote:
>>>       
>>>> Not in the ABI doc, is there and doc at all, and if not could someone 
>>>> who knows where it's used might give me a hint, as a quick look didn't 
>>>> bring enlightenment. Or is it a future hook which doesn't work yet?
>>>>         
>>> That's something that in theory may allow you to resume the system from
>>> and initrd script.
>>>
>>> Basically, you write your resume device's major and minor numbers
>>> into it as the "MAJ:MIN" string (eg. "8:3" for /dev/sda3 on my box) and the
>>> kernel will try to read the image from this device and restore it.
>>>
>>> It only works with partitions and the use of it us discouraged, so it's
>>> deliberately undocumented.
>>>
>>>       
>> Thanks, that's just different enough from what little info I had to make 
>> what I have not work. I'm looking at resume from a non-swap location.
>>     
>
> Only suspend2 can do this right now.  The built-in swsusp can resume from a
> swap file as long as it's not located on LVM.
>   
Sounds like sispend2 is still needed, I haven't needed a suspending 
kernel in a few years, and I was hoping that with suspend working in 
mainline that resume would have been implemented. Sounds as if that's 
not the case, my swap is RAID1, I was hoping to resume from one of the 
mirrors, since they are based on a partition. No joy wit or without 
/sys/power/resume, so I'll look further.

-- 
bill davidsen <davidsen@....com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979

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