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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