Hi Carles, On Friday 21 September 2007, Carles Pina i Estany wrote: > Hello! > > I have a Logitech Quickcam Pro for Notebooks, that seems that is well > supported. > > But is not working. I'm using a Kernel 2.6.22, compiled myself, with > Video4Linux enabled. In dmesg I can see: > > ------------------ > Linux video capture interface: v2.00 > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c3) > uvcvideo: Failed to query (135) UVC control 1 (unit 0) : -110 (exp. 26). > uvcvideo: Failed to query (129) UVC control 1 (unit 0) : -110 (exp. 26). > uvcvideo: Failed to initialize the device (-5). > usbcore: registered new interface driver uvcvideo > USB Video Class driver (v0.1.0) > ---------------- > /dev/video0 is not created > > What can I do? I've read something about firmware bug, etc. but last > year this camera worked :-) just I have not used and now... not working. > > Some problem in some kernel option? where I can look? I have been > browsing without any success.
Kernel 2.6.22 includes bug fixes in the usbaudio driver that can trigger another firmware bug in the webcam. Fortunately this one seems to have a workaround, although not a pretty one. The webcam audio interface must be initialised before the video interface. Linux will by default initialise the video interface first, so you need to remove the uvcvideo.ko module from the /lib/modules subdirectory where it gets loaded automatically, and load it manually after plugging the webcam. This is not a pretty workaround as it requires manual operations every time you plug the camera, but it should work. Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
