linux-kernel - Re: [Regression] USB wakeup problem on Toshiba Portege R500

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Date:	Mon, 12 Jan 2009 22:10:43 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Frans Pop <elendil@...net.nl>, <oliver@...kum.org>,
	<gregkh@...e.de>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-pm@...ts.linux-foundation.org>, <pavel@...e.cz>,
	<torvalds@...ux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [Regression] USB wakeup problem on Toshiba Portege R500

On Mon, 12 Jan 2009, Rafael J. Wysocki wrote:

> On Monday 12 January 2009, Alan Stern wrote:
> > On Fri, 9 Jan 2009, Rafael J. Wysocki wrote:
> > 
> > > > My proposal:
> > > > 
> > > > 	Devices and events that are clearly associated with system
> > > > 	wakeup should be enabled by default.  For example: Power
> > > > 	button and laptop lid.
> > > 
> > > Agreed.
> > > 
> > > > 	All other devices capable of waking up the system should be
> > > > 	disabled by default.  This presumably includes every PCI
> > > > 	device.  If users want keyboard or mouse events to cause
> > > > 	a system resume then they will have to configure their
> > > > 	desktop management program to enable it.
> > > 
> > > I generally agree, with one exception.  There are network adapters which
> > > can be enabled to wake up by the BIOS and their drivers set them up for WoL
> > > currently on this basis.  These should remain enabled IMO.
> > 
> > How do we know which adapters these are?  IMO the PCI core should
> > disable wakeup by default for all devices when they are detected.
> 
> This is what we do.
> 
> > Is it sufficient to have the adapter drivers enable wakeup during
> > their probe routines?
> 
> Yes, it is.

Therefore all we need is a patch to change the USB host controller
drivers.  They should call device_set_wakeup_capable() instead of
device_init_wakeup().

I just got back from vacation so things will be busy for a few days, 
but I'll send out such a patch soon.

Alan Stern

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