*fascinating* - it works fine when plugged into the USB port in the back of my machine, but not in the front. Thanks for all your advice.
Andy ---------------------------------------------------------------------- Andrew J Perrin - andrew_perrin (at) unc.edu - http://perrin.socsci.unc.edu Associate Professor of Sociology; Book Review Editor, _Social Forces_ University of North Carolina - CB#3210, Chapel Hill, NC 27599-3210 USA On Tue, 15 Jan 2008, Laurent Pinchart wrote: > Hi Andrew, > > On Tuesday 15 January 2008, Andrew Perrin wrote: >> On Tue, 15 Jan 2008, Laurent Pinchart wrote: >>> Hi Andrew, >>> >>> On Tuesday 15 January 2008, Andrew Perrin wrote: >>>> I have a quickcam 9000 pro working fine with luvcview, but it gives the >>>> famous "black rectangle" with Skype. This is the latest (166) rev. of >>>> uvcvideo. These messages are in the log when I try: >>>> >>>> Jan 14 19:53:08 joehill kernel: ohci_hcd 0000:00:0b.0: leak ed f74175c0 >>>> (#81) state 2 >>>> Jan 14 19:53:22 joehill kernel: uvcvideo: Failed to submit URB 0 (-28). >>>> Jan 14 19:53:30 joehill kernel: ohci_hcd 0000:00:0b.0: leak ed f7417600 >>>> (#81) state 2 >>> >>> -28 is -ENOSPC. It means using the device would exceed the available USB >>> bus bandwidth. If your webcam is plugged into a hub try moving it to a >>> root port. Make sure you're using an EHCI controller. >>> >>> Best regards, >>> >>> Laurent Pinchart >> >> Very interesting, and thanks for your quick reply. Plugging it directly >> into the USB port (instead of through a hub) makes both luvcview *and >> Skype* give a very flickery, but recognizable, image. luvcview dies after >> a few seconds with the result: >> >> Ignoring empty buffer ... >> Ignoring empty buffer ... >> Ignoring empty buffer ... >> Ignoring empty buffer ... >> Unable to dequeue buffer (22). >> Error grabbing >> Clean Up done Quit >> >> ...while Skype just keeps the flickery image on. /var/log/syslog >> contains: >> >> usb 1-6: new high speed USB device using ehci_hcd and address 9 >> usb 1-6: configuration #1 chosen from 1 choice >> uvcvideo: Found UVC 1.00 device <unnamed> (046d:0990) >> usb 1-6: USB disconnect, address 9 >> usb 1-6: new high speed USB device using ehci_hcd and address 10 >> usb 1-6: device descriptor read/all, error -71 > > Your webcam seem to be very flaky. Failing to respond to the first GET > DESCRIPTOR request with -71 means serious hardware trouble. > >> usb 1-6: new high speed USB device using ehci_hcd and address 11 >> usb 1-6: configuration #1 chosen from 1 choice >> uvcvideo: Found UVC 1.00 device <unnamed> (046d:0990) >> uvcvideo: Failed to query (131) UVC control 1 (unit 0) : -71 (exp. 26). >> uvcvideo: Failed to query (131) UVC control 1 (unit 0) : -71 (exp. 26). > > You should check your cables. Is your computer in an extremely noisy > environment (electrically speaking) ? Do you experience the same kind of > trouble with other USB devices ? > > Best regards, > > Laurent Pinchart > _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
