linux-kernel - Re: Changes to PM layer break userspace

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Date:	Fri, 22 Dec 2006 21:09:37 +0000
From:	Pavel Machek <pavel@...e.cz>
To:	David Brownell <david-b@...bell.net>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: Changes to PM layer break userspace

Hi!

> > The existence of the power/state interface wasn't a bug - it was a 
> > deliberate decision to add it. It's the only reason the 
> > dpm_runtime_suspend() interface exists. 

Actually, if we noticed power/state during PM framework review, it
would have been killed. It is just way too ugly.

> > > In contrast, the /sys/devices/.../power/state API has never had many
> > > users beyond developers trying to test their drivers (without taking
> > > the whole system into a low power state, which probably didn't work
> > > in any case), and has *always* been problematic.  And the change you
> > > object to doesn't "break" anything fundamental, either.  Everything
> > > still works.
> > 
> > It's used on every Ubuntu and Suse system,
> 
> Odd how the relevant Suse developers didn't mention any issues with
> those files going away, any of the times problems with them were
> discussed on the PM list.  Also, I have a Suse system that doesn't
> use those files for anything ... maybe only newer release use it.

Not on *every* suse system. power/state is known to oops kernels, so
it is only enabled when user explicitely asks for 'dangerous aggresive
experimental power saving' or something like that.
-- 
Thanks for all the (sleeping) penguins.
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