Re: [PATCH] From 2.6.39-rc1 onward, the Logitech Quickcam Fusion webcam (046d:08c1) stops

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On Fri, 6 Jul 2012, Alan Cox wrote:

> > Yes, but we still need to know the reason why.  Neither Rafael nor I 
> > has been able to figure out why that commit messed things up.
> 
> Was the driver doing any dynamic autosuspend at all until that point ?

I don't know...  but whatever it was doing before the commit, it should 
be doing the same thing afterward.

> From the bug report it goes castors up in windows too if a suspend/resume
> occurs.

Yes, it's definitely a bug in the webcam.

On the other hand, there is a similar bug report for a Logitech C525 
webcam which works properly when suspended/resumed by an xHCI 
controller but crashes when suspended/resumed by an EHCI controller.  I 
have no idea why.

Laurent, you might want to take a look at that thread, in particular, 
at this message:

	http://marc.info/?l=linux-usb&m=134115837927619&w=2

Can you explain the difference between the USB-2 and USB-3 usbmon 
traces?

Alan Stern

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