linux-kernel - Re: [PATCH][RFC] Kill off legacy power management stuff.

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Message-ID: <46265F60.4040600@tmr.com>
Date:	Wed, 18 Apr 2007 14:11:44 -0400
From:	Bill Davidsen <davidsen@....com>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: [PATCH][RFC] Kill off legacy power management stuff.

Robert P. J. Day wrote:
> On Tue, 17 Apr 2007, Bill Davidsen wrote:
>
>   
>> Rafael J. Wysocki wrote:
>>     
>>> [appropriate CCs added]
>>>
>>> On Friday, 13 April 2007 02:33, Robert P. J. Day wrote:
>>>       
>>>> just something i threw together, not in final form, but it represents
>>>> tossing the legacy PM stuff.  at the moment, the menuconfig entry for
>>>> PM_LEGACY lists it as "DEPRECATED", while the help screen calls it
>>>> "obsolete."  that's a good sign that it's getting close to the time
>>>> for it to go, and the removal is fairly straightforward, but there's
>>>> no mention of its removal in the feature removal schedule file.
>>>>         
>>> It's been like this for a long long time.  I think you're right that it can
>>> be
>>> dropped, but I don't know the details (eg. why it hasn't been dropped yet).
>>>
>>>       
>> One reason was that there are (were?) a number of machines which only powered
>> down properly using apm. It was discussed as part of shutting down after power
>> failure when your UPS is running out of power.
>>     
>
> um ... what does APM have to do with legacy PM?  two different issues,
> no?
>   
Since the patches are going into apm.c and apm was used for suspend and 
poweroff before ACPI was a feature of the hardware, I assume there's a 
relationship. As of 2.6.9 ACPI still couldn't power down one of my old 
boxes, it hasn't been updated since that time, so I can't say what later 
kernels will do.

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

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