From: Pavel Machek <pavel@suse.cz>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-pm@lists.osdl.org
Subject: Re: Runtime device power management in userspace
Date: Sat, 24 Dec 2005 01:41:08 +0100 [thread overview]
Message-ID: <20051224004108.GD16043@elf.ucw.cz> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0512231016170.15462-100000@netrider.rowland.org>
On Pá 23-12-05 10:17:45, Alan Stern wrote:
> On Fri, 23 Dec 2005, Holger Macht wrote:
>
> > Hi,
> >
> > We implemented device runtime power management in a userspace application
> > (the powersave daemon). In this specific case, it means to successively
> > put pci devices into D3 powersave mode with writing a numerical '3' to the
> > corresponding power state file.
>
> > Now that we get more and more votes that this could be very dangerous and
> > problematic because of the current kernel implementation, we decided to
> > gather some more comments from involved people and experts in this
> > area. That's the aim of my post to this list. Opinions are welcome!
>
> Remember that you're likely to run into trouble if you try to suspend a
> device that has unsuspended children.
I guess we only want to suspend, leaf PCI devices for now. There's
where the lowest-hanging fruit is.
Pavel
--
Thanks, Sharp!
next prev parent reply other threads:[~2005-12-24 0:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-23 14:30 Runtime device power management in userspace Holger Macht
2005-12-23 15:12 ` Patrick Mochel
2005-12-24 0:40 ` Pavel Machek
2005-12-26 20:43 ` Patrick Mochel
2005-12-26 22:33 ` Pavel Machek
2005-12-27 18:59 ` Patrick Mochel
2005-12-27 19:22 ` Pavel Machek
2005-12-27 19:29 ` Patrick Mochel
2005-12-27 19:41 ` Pavel Machek
2005-12-27 20:40 ` Patrick Mochel
2005-12-27 21:06 ` Pavel Machek
2005-12-26 22:47 ` Alan Stern
2005-12-27 17:29 ` Pavel Machek
2005-12-27 17:36 ` Randy.Dunlap
2005-12-24 15:31 ` Holger Macht
2005-12-26 20:58 ` Patrick Mochel
2005-12-27 20:04 ` Pavel Machek
2005-12-27 20:54 ` Patrick Mochel
2005-12-23 15:17 ` Alan Stern
2005-12-24 0:41 ` Pavel Machek [this message]
2005-12-24 0:43 ` Pavel Machek
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