On Tue, 29 Nov 2011, Sid Boyce wrote: > On 29/11/11 15:59, Sid Boyce wrote: > > On 28/11/11 07:38, Greg KH wrote: > >> On Mon, Nov 28, 2011 at 09:24:11AM +0200, Tomi Orava wrote: > >>> Quoting Sid Boyce<sboyce@xxxxxxxxxxxxxxxx>: > >>> > >>>> dmesg reporting "uvcvideo: Failed to submit URB 0 (-28). > >>>> The camera switches on in skype and never turns off. this is with > >>>> openSUSE 12.2 Miletone 0. > >>>> > >>>> Works in Kubuntu 11.10 with kernel 3.0.0-13-generic. > >>>> Back on 3.1.0 on openSUSE where it definitely works. > >>> I seem to have exactly same problem with yesterday evenings update > >>> from 3.1 to 3.1.3 with Logitech C270 usb video camera. > >>> It worked just fine with 3.1.0 and with 3.1.3 it only produces the > >>> above mentioned error (with same values). Now the usb device is > >>> listed with lsusb just fine, but I get no picture. > >> Odd, the 3.1.0 version should have caused the same problems, we only > >> added support to the quirk table for more cameras, not the C270 which > >> should have aready been there. > >> > >> Can you run 'git bisect' between 3.1.0 and 3.1.3 and find the offending > >> patch? > >> > >> thanks, > >> > >> greg k-h > >> > > The bad commit is 811c926c538f7e8d3c08b630dd5844efd7e000f6 > > Reverting it, my camera is working again. > > Regards > > Sid. > > > I also hand patched a 3.2-rc3 kernel with the patch from Alan Stern > "Re: [PATCH] EHCI : Fix a regression in the ISO scheduler" > That did not fix the problem. Can you send the output from "lsusb -v"? Also, I'd like to get some debugging information. This will require you to build a kernel with CONFIG_USB_DEBUG enabled. With that kernel running, and when the camera fails in skype, mount a debugfs filesystem on /sys/kernel/debug and go to the subdirectory of /sys/kernel/debug/usb/ehci corresponding to the bus that the camera is plugged into. Let's see what the various files in there say. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
