From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: Request for testing remote wakeup during STD Date: Tue, 13 Feb 2007 12:35:47 +0100 Message-ID: <20070213113547.GI12996@elf.ucw.cz> References: 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 mailing list List-Id: linux-pm@vger.kernel.org Hi! > There have been reports of problems related to shutting down with remote = > wakeup enabled on EHCI USB controllers in 2.6.20; see > = > http://bugzilla.kernel.org/show_bug.cgi?id=3D7828 > = > In brief, some people have found that if ehci-hcd is loaded and the = > controller is suspended when they try to shut down their systems, the = > machine reboots immediately instead of turning off. Apparently this is = > caused by the firmware mistakenly thinking that a remote-wakeup event has = > occurred. Admittedly, remote wakeup from a system sleep is still black = > magic to most of us... > = > I wrote a patch to try and fix the problem by turning off EHCI remote > wakeup from within the driver's shutdown() method. The patch is here: > = > http://bugzilla.kernel.org/attachment.cgi?id=3D10313&action=3Dview > = > However I'm concerned that this might affect suspend-to-disk. Some lucky = > people have systems which do keep their EHCI controllers in D3hot during = > STD, and such people might reasonably want Wake-on-USB to work properly. = > It seems likely that the patch would prevent it from working. I do not think such "lucky people" exist. And not being able to control the wakeups.... no I do not think that feature is useful, yet. KISS. Pavel -- = (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html