Re: [PATCH v2 1/3] usb: add is_usb_mouse routine and remote wakeup quirk

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On Wed, 28 Aug 2013, Greg Kroah-Hartman wrote:

> On Wed, Aug 28, 2013 at 01:13:46PM -0400, Alan Stern wrote:
> > On Wed, 28 Aug 2013, Greg Kroah-Hartman wrote:
> > 
> > > > [Q] Why the special devices are only mice? Would high speed devices
> > > > such as 3G modem or USB Bluetooth adapter trigger this issue?
> > > > - Current this sensitivity is only confined to devices that use Pixart
> > > >   controllers. This controller is designed for use with LS mouse
> > > > devices only. We have not observed any other devices failing. There
> > > > may be a small risk for other devices also but this patch (reset
> > > > device in resume phase) will cover the cases if required.
> > > 
> > > Then just do this "quirk" for Pixart controller devices.  Don't penalize
> > > everyone else.
> > 
> > Is there any way to detect when a device uses a Pixart controller?  I 
> > don't see how you could tell.
> 
> Vendor device id should tell you what you need to know, right?

Not necessarily.  Manufacturers often get their USB hardware from other
suppliers and then overwrite the vendor and product IDs in the firmware
with their own.

Of course, I don't know if that's true in this case.  The guys at AMD 
should be able to tell easily enough; they have a bunch of these mice 
to test with.

Alan Stern

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