On Monday, 2. February 2009, Alan Stern wrote: > On Mon, 2 Feb 2009, Uli Luckas wrote: > > Hi Alan, > > we have had a (userspace) wake-lock implementation on our handyPC devices > > for a couple of years now. So maybe I can shed some light. > > > > The above quote underlines pretty well, where Arve's and your ideas of > > eraly-suspend and wake-locks diverge. And why you are missunderstanding > > each other. > > Arve is always talking about "blanking the screen" because that's what > > the users sees. From the user's perspective the device is "suspended" as > > soon as his user interfaces vanishes. That's probably also why his > > notions of "suspend" and "wake" are not alway following a strict > > definition. > > And that's partly why I have been complaining about the things he > writes. To a kernel programmer, "suspend" has a very specific meaning, > quite different from what it might mean to a user. When Arve posts on > a kernel-oriented mailing list, he should use such words in a way his > readers will understand. > Full Ack > > If the device stays blanked while the user has his 10 min phone > > conversation, then he won't even notice wether the device suspends or not > > after the call. This is the idea. The user does not care for anything > > they can't see. > > > > Arve is not talking about a laptop that needs to sleep befor it's > > ventilation slot are covered. He is talking about a phone that could well > > do with only blanking it's screen. Except it want's to save battery when > > ever possible. > > The problem is that he's talking about making changes to a kernel that > will be installed in all sorts of machines, from phones all the way up > to supercomputers. When you do this, you have to broaden your point of > view -- your code has to run correctly in all of these settings. > Well, it should not interfere with any of these settings. And I think it is understood by now that we has to take back the semantic change of "echo mem > /sys/power/state" On the other hand, I think it is quite reasonable to have aditional suspend mechanisms on a phone then you have on a super computer. Obviously you don't want the supercomputer to suspend everytime nobody is watching :-) Uli -- ------- ROAD ...the handyPC Company - - - ) ) ) Uli Luckas Head of Software Development ROAD GmbH Bennigsenstr. 14 | 12159 Berlin | Germany fon: +49 (30) 230069 - 62 | fax: +49 (30) 230069 - 69 url: www.road.de Amtsgericht Charlottenburg: HRB 96688 B Managing director: Hans-Peter Constien _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
