From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: Runtime device power management in userspace Date: Sat, 24 Dec 2005 01:41:08 +0100 Message-ID: <20051224004108.GD16043@elf.ucw.cz> References: <20051223143047.GC16463@f192.suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-pm-bounces@lists.osdl.org Errors-To: linux-pm-bounces@lists.osdl.org To: Alan Stern Cc: linux-pm@lists.osdl.org List-Id: linux-pm@vger.kernel.org On P=E1 23-12-05 10:17:45, Alan Stern wrote: > On Fri, 23 Dec 2005, Holger Macht wrote: >=20 > > Hi, > >=20 > > We implemented device runtime power management in a userspace applica= tion > > (the powersave daemon). In this specific case, it means to successive= ly > > put pci devices into D3 powersave mode with writing a numerical '3' t= o the > > corresponding power state file. >=20 > > 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! >=20 > Remember that you're likely to run into trouble if you try to suspend a= =20 > 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 --=20 Thanks, Sharp!