Re: Request for testing remote wakeup during STD

[Nigel Cunningham <nigel@nigel.suspend2.net>]

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