Re: Request for testing remote wakeup during STD

[Pavel Machek <pavel@suse.cz>]

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=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.

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
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html