Hi Alan. On Fri, 2007-02-09 at 22:59 -0500, Alan Stern wrote: > 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=7828 > > 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=10313&action=view > > 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. > > Does anyone have a system capable of testing this? I think Macs are most > likely to have the necessary hardware support. I'd love to be able to help you. My lappy loads ehci and lsusb shows the controller, but I'll be darned if I can find the socket! I have other things to get done right now, but if no-one beats me to it, I'll try the desktop I have - I think that has ehci somewhere. Regards, Nigel
