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Date:	Sat, 28 Apr 2007 23:43:27 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: Back to the future.

On Apr 28, 2007, at 19:45:01, Linus Torvalds wrote:
> On Sun, 29 Apr 2007, Rafael J. Wysocki wrote:
>> Well, I'm not sure whether or not that still would have been the  
>> case if we had stopped to freeze kernel threads for the  
>> hibernation/suspend.
>
> Did you miss the email where Paul pointed out that Mac/PowerPC  
> didn't use to do any of this? And apparently never had any issues  
> with it? And probably worked more reliably several years ago than  
> suspend/hibernation
> does _today_?

Still works pretty reliably; the last time my PowerBook G4 was  
rebooted was 6 weeks ago.  Once every 60 suspends or so the kernel  
USB driver gets really confused and doesn't wake up the USB  
controller properly, leading to dead keyboard/mouse, but other than  
that I never have problems.  I wouldn't be surprised if I could  
comment out 90% of the "suspend" code and still have it work, the  
hardware in is is incredibly robust.  I can even swap batteries while  
it's in suspend-to-RAM, as long as I do it in less than 45 sec or so;  
I get around 6-7 days of suspend-to-RAM time on a full charge.

Cheers,
Kyle Moffett

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