linux-kernel - Re: [PATCH] x86 APM: delete Linux kernel APM support

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Message-ID: <4DA34619.6010708@zytor.com>
Date:	Mon, 11 Apr 2011 11:19:05 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Len Brown <lenb@...nel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>, x86@...nel.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86 APM: delete Linux kernel APM support

On 04/11/2011 06:05 AM, Pavel Machek wrote:
> Hi!
> 
>>>> Well, it kind of does but not really. :-)
>>>>
>>>> The main problem with APM is that nobody really works on it and I'm not sure
>>>> if there are any active users.  At least no one reports any problems with it,
>>>> which is kind of surprising, given the number of chages we've made in the PM
>>>> core for the last couple of years.  So quite likely it's just become
>>>> non-functional over time anyway, but we have no confirmation.
>>>
>>> It was working ok last time I tried -- cca 6/2010.
>>
>> What aspects of it did you test, and on what platform?
> 
> thinkpad 560X.
> 
> I tested basic boot, IIRC it did turn backlight off properly in
> screensaver and even suspend worked.
> 									Pavel

OK, but I presume runtime power management wasn't on the list at least
on what matters.

	-hpa

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