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. Thanks, Alan Stern
