linux-kernel - Re: [PATCH 4/4] Remove obsolete piece of PM documentation

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Date:	Thu, 26 Jun 2008 22:34:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	Pavel Machek <pavel@...e.cz>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 4/4] Remove obsolete piece of PM documentation

On Thursday, 26 of June 2008, Len Brown wrote:
> 
> > > > > > -               Linux Power Management Support
> > > > > > -
> > > > > > -This document briefly describes how to use power management with your
> > > > > > -Linux system and how to add power management support to Linux drivers.
> > > > > > -
> > > > > > -APM or ACPI?
> > > > > > -------------
> > > > > > -If you have a relatively recent x86 mobile, desktop, or server system,
> > > > > > -odds are it supports either Advanced Power Management (APM) or
> > > > > > -Advanced Configuration and Power Interface (ACPI).  ACPI is the newer
> > > > > > -of the two technologies and puts power management in the hands of the
> > > > > > -operating system, allowing for more intelligent power management than
> > > > > > -is possible with BIOS controlled APM.
> > > > > > -
> > > > > > -The best way to determine which, if either, your system supports is to
> > > > > > -build a kernel with both ACPI and APM enabled (as of 2.3.x ACPI is
> > > > > > -enabled by default).  If a working ACPI implementation is found, the
> > > > > > -ACPI driver will override and disable APM, otherwise the APM driver
> > > > > > -will be used.
> > > > > > -
> > > > > > -No, sorry, you cannot have both ACPI and APM enabled and running at
> > > > > > -once.  Some people with broken ACPI or broken APM implementations
> > > > > > -would like to use both to get a full set of working features, but you
> > > > > > -simply cannot mix and match the two.  Only one power management
> > > > > > -interface can be in control of the machine at once.  Think about it..
> > > > > 
> > > > > I'd keep this; it is still true, and we still support both.
> > > > > 
> > > > > Maybe it should be moved into Doc*/power/apm.txt or something.
> > > > 
> > > > Yes, if there is a good sub-directory for it, please put it there.
> 
> I think this is already covered in the Kconfig help for ACPI and APM
> and doesn't need a Documentation file.

It won't hurt to have the file, though.

I have reworked the patch already and I'd rather not do that again the other
way around. ;-)

Thanks,
Rafael
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