linux-kernel - RE: [DISCUSSION] USB device remote wakeup is not working for S3 case

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Message-ID: <0C18FE92A7765D4EB9EE5D38D86A563A01C43756@SHSMSX103.ccr.corp.intel.com>
Date:	Tue, 23 Dec 2014 05:40:37 +0000
From:	"Du, Changbin" <changbin.du@...el.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Wu, Hao" <hao.wu@...el.com>
Subject: RE: [DISCUSSION] USB device remote wakeup is not working for S3 case

> You have to make sure that wakeup is also enabled for the host
> controller the device is attached to.  For some host controllers, it
> may also be necessary to enable wakeup for the root hub.
> 
Yes, the root-hub is not wakeup enabled by default, actually hub
devices are not enabled. It works after I enable it via sysfs interface.

> > Could we also enable wakeup for usb mouse? Or is there any concern to
> enable it?
> > Per my opinion, most people may expect clicking mouse can awake system.
> 
> It doesn't matter to me, but you should ask the people on the
> linux-input mailing list.
> 
> Also, what about wakeup for a non-USB mouse?  Shouldn't that be enabled
> as well?
Unfortunately the mouse I found are all of usb so cannot confirm it. The
concern is if we want usb keyboard/mouse wakeup work by default, it does
make sense only if the parent hubs are also enabled by default.  This is a policy
issue and may be better place it on userspace. I have no better idea :) .

> 
> Alan Stern
Regards
Du, Changbin
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