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
