Am Samstag, 27. August 2011, 22:16:00 schrieb Alan Stern:
> On Sat, 27 Aug 2011, Oliver Neukum wrote:
>
> > From 6005022e0cd3cfaf0826c9784bea584c63d30498 Mon Sep 17 00:00:00 2001
> > From: Oliver Neukum <oli...@neukum.org>
> > Date: Sat, 27 Aug 2011 19:59:17 +0200
> > Subject: [PATCH] USB:add RESET_RESUME for webcams shown to be quirky
> >
> > The new runtime PM code has shown that many webcams suffer
> > from a race condition that may crash them upon resume.
> > Runtime PM is especially prone to show the problem because
> > it retains power to the cameras at all times. However
> > system suspension may also crash the devices and retain
> > power to the devices.
> > The only way to solve this problem without races is in
> > usbcore with the RESET_RESUME quirk.
>
> Has this been discussed on the linux-media list or with the webcam
> maintainers?
No. As far as I can tell, the problem arises in the audio parts of the cameras.
> Is this related in any way to Bugzilla #40352?
Again, no. It is an audio problem. That said, of course RESET_RESUME
might also fix issues with video devices acting up.
Though it lacks a certain ellegance.
> > @@ -65,6 +83,9 @@ static const struct usb_device_id usb_quirk_list[] = {
> > { USB_DEVICE(0x0638, 0x0a13), .driver_info =
> > USB_QUIRK_STRING_FETCH_255 },
> >
> > + /* Guillemot Webcam Hercules Dualpix Exchange*/
> > + { USB_DEVICE(0x06f8, 0x0804), .driver_info = USB_QUIRK_RESET_RESUME },
> > +
> > /* Saitek Cyborg Gold Joystick */
> > { USB_DEVICE(0x06a3, 0x0006), .driver_info =
> > USB_QUIRK_CONFIG_INTF_STRINGS },
>
> Come on, Oliver! 0x06f8 > 0x06a3.
OK, I am officially dyslexic.
Regards
Oliver
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