Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   David Laight <David.Laight@ACULAB.COM>
To:     'Alan Stern' <stern@rowland.harvard.edu>,
        Greg KH <gregkh@linuxfoundation.org>
CC:     Mario Limonciello <mario.limonciello@amd.com>,
        Jiri Kosina <jikos@kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>,
        "open list:USB HID/HIDBP DRIVERS [USB KEYBOARDS, MICE, REM..." 
        <linux-usb@vger.kernel.org>,
        "open list:HID CORE LAYER" <linux-input@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        Richard Gong <richard.gong@amd.com>
Subject: RE: [PATCH v2] HID: usbhid: set mouse as a wakeup resource
Thread-Topic: [PATCH v2] HID: usbhid: set mouse as a wakeup resource
Thread-Index: AQHYgluyoC2hoFBpKUup69QWlLdMjq1Tuqsg
Date:   Fri, 17 Jun 2022 15:39:10 +0000
Message-ID: <419f8edc2a7744ecbfaa0728227db180@AcuMS.aculab.com>
References: <20220616183142.14472-1-mario.limonciello@amd.com>
 <YqugZQiDu35Y8lTu@kroah.com> <YqyYIt2MLmoCRSA9@rowland.harvard.edu>
In-Reply-To: <YqyYIt2MLmoCRSA9@rowland.harvard.edu>
Accept-Language: en-GB, en-US
MIME-Version: 1.0
Content-Language: en-US
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8BIT
Precedence: bulk

From: Alan Stern
> Sent: 17 June 2022 16:05
...
> Another issue is whether wakeup for a mouse means pressing a button or
> just moving the mouse.  For a mouse that uses LEDs to sense motion,
> moving it won't generate a wakeup request -- USB suspend does not allow
> the mouse to use enough current to keep the LEDs illuminated.  On the
> other hand, there's no reason why wakeup by pressing a button shouldn't
> always work.

I'm not even sure I want a system to wake up because it's mouse
gets knocked.
I guess a mouse could include accelerometers so that you can shake it!

I've an idea that one of my systems manages to boot if the mouse
is knocked (and it was last shutdown from windows).
At least, that it why I think it is sometimes booting up.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)