[Ubuntu 11.10, DVC100] /dev/video0 disappears

[mark.farnell]

I am using Dazzle DVC100 for video capture and it used to work perfectly. However after I upgrade to Ubuntu 11.10 (and therefore linux 3.0), when I insert the Dazzle DVC 100 device, /dev/video0 no longer appears, and "lsusb" also no longer recognizes the DVC 100 (normally, the module em28xx will be automatically loaded when you insert the DVC100.

After inserting the DVC100, these messages appear in dmesg:

usb 5-2: New full speed USB device number 2 using uhci_hcd
usb 5-2: device descriptor read/64, error -71
usb 5-2: device descriptor read/64, error -71
usb 5-2: New full speed USB device number 3 using uhci_hcd
usb 5-2: device descriptor read/64, error -71
usb 5-2: device descriptor read/64, error -71
usb 5-2: New full speed USB device number 4 using uhci_hcd
usb 5-2: device not accepting address 4, error -71
usb 5-2: New full speed USB device number 5 using uhci_hcd
usb 5-2: device not accepting address 5, error -71
hub 5-0:1.0: unable to enumerate USB device on port 2




So how can I get it working again?

Mark

[Rémi Denis-Courmont]

Make sure you have ehci_hcd loaded and you inserted the device in a USB 2.0 port. It looks like your computer is trying to use USB 1.

This looks like a USB driver issue in the Ubuntu Linux kernel.