From: Pavel Machek <pavel@ucw.cz>
To: Greg KH <gregkh@suse.de>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
linux-pm@lists.linux-foundation.org,
Len Brown <len.brown@intel.com>,
"Jean Delvare (PC drivers core)" <khali@linux-fr.org>,
"Ben Dooks (embedded platforms)" <ben-linux@fluff.org>,
kyungmin.park@samsung.com, myungjoo.ham@gmail.com,
LKML <linux-kernel@vger.kernel.org>,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [RFC PATCH v2 1/3] PM / Core: suspend_again callback for device PM.
Date: Wed, 27 Apr 2011 00:14:20 +0200 [thread overview]
Message-ID: <20110426221420.GC29092@elf.ucw.cz> (raw)
In-Reply-To: <20110426205745.GB20381@suse.de>
Hi!
> > > What is the root problem that this is trying to solve?
> >
> > It is trying to fix machines that need to run periodic kernel tasks
> > even when user asked them to sleep. Zaurus needs to periodicaly wake
> > up to be able to charge battery in s2ram state, for example.
>
> That sounds like a bug in userspace you are trying to work around. Why
> not solve it there first?
Can you be more specific?
The userspace is standard Debian; or maybe even init=/bin/bash. I want
to sleep the machine before I move, so I do echo mem >
/sys/power/state, as I do on PC.
Then I do plug the machine into AC when I move near outlet. In PC,
embedded controller wakes up and starts charging. In Zaurus, it is
kernel (SPI+charging drivers) that wake up, start charging, and go
back to sleep.
Then I (the user) press the power button and get "bash#" back. Where
is the userspace bug?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2011-04-26 22:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-20 8:28 [RFC PATCH] PM / Core: suspend_again cb for syscore_ops MyungJoo Ham
2011-04-20 10:36 ` Pavel Machek
2011-04-20 20:28 ` Rafael J. Wysocki
2011-04-21 7:03 ` MyungJoo Ham
[not found] ` <1303781471-2477-1-git-send-email-myungjoo.ham@samsung.com>
2011-04-26 11:47 ` [RFC PATCH v2 1/3] PM / Core: suspend_again callback for device PM Rafael J. Wysocki
2011-04-26 13:17 ` Greg KH
2011-04-26 20:38 ` Pavel Machek
2011-04-26 20:49 ` Rafael J. Wysocki
2011-04-26 21:11 ` Pavel Machek
2011-04-26 21:36 ` Rafael J. Wysocki
2011-04-26 22:06 ` Pavel Machek
2011-04-26 20:57 ` Greg KH
2011-04-26 22:14 ` Pavel Machek [this message]
2011-04-26 20:35 ` Pavel Machek
2011-04-26 20:47 ` Rafael J. Wysocki
2011-04-26 21:06 ` Pavel Machek
2011-04-26 21:46 ` Rafael J. Wysocki
2011-04-26 22:10 ` Pavel Machek
2011-04-26 22:32 ` Rafael J. Wysocki
2011-04-27 6:36 ` MyungJoo Ham
2011-04-27 9:46 ` Stanislav Brabec
2011-04-27 10:47 ` MyungJoo Ham
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