Hi Sab, On Thursday 10 January 2008, RUMI Szabolcs wrote: > Hello! > > I'm blessed with a Logitech QC Fusion (046d:08c1) in my neighborhood... > I get (the usual?) problems on enumeration: > > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c1) > 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) > ehci_hcd 0000:00:1d.7: remove, state 1 > usb usb1: USB disconnect, address 1 > usb 1-2: USB disconnect, address 2 > ehci_hcd 0000:00:1d.7: USB bus 1 deregistered > ACPI: PCI interrupt for device 0000:00:1d.7 disabled > usb 2-2: new full speed USB device using uhci_hcd and address 2 > usb 2-2: configuration #1 chosen from 1 choice > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c1) > 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: deregistering interface driver uvcvideo > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c1) > uvcvideo: Failed to query (135) UVC control 1 (unit 0) : -32 (exp. 26). > uvcvideo: Failed to query (129) UVC control 1 (unit 0) : -32 (exp. 26). > uvcvideo: Failed to initialize the device (-5). > usbcore: registered new interface driver uvcvideo > USB Video Class driver (v0.1.0) > usbcore: deregistering interface driver uvcvideo > usb 2-2: USB disconnect, address 2 > usbcore: registered new interface driver uvcvideo > USB Video Class driver (v0.1.0) > usb 2-2: new full speed USB device using uhci_hcd and address 3 > usb 2-2: configuration #1 chosen from 1 choice > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c1) > 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: deregistering interface driver uvcvideo > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c1) > uvcvideo: Failed to query (135) UVC control 1 (unit 0) : -32 (exp. 26). > uvcvideo: Failed to query (129) UVC control 1 (unit 0) : -32 (exp. 26). > uvcvideo: Failed to initialize the device (-5). > usbcore: registered new interface driver uvcvideo > USB Video Class driver (v0.1.0) > usbcore: deregistering interface driver uvcvideo > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c1) > uvcvideo: Failed to query (135) UVC control 1 (unit 0) : -32 (exp. 26). > uvcvideo: Failed to query (129) UVC control 1 (unit 0) : -32 (exp. 26). > uvcvideo: Failed to initialize the device (-5). > usbcore: registered new interface driver uvcvideo > USB Video Class driver (v0.1.0) > usbcore: deregistering interface driver uvcvideo > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c1) > usbcore: registered new interface driver uvcvideo > USB Video Class driver (v0.1.0) > > As you can see, after several rmmod/modprobe cycles on uvcvideo sooner > or later the camera gets detected. Somewhere I've read that this > problem is restricted to high-speed usb mode so I tried to rmmod ehci-hcd > but apparently it doesn't work any better in full-speed mode than in > high-speed mode. > > Anyway, after an occasional correct detection of the camera, > the following behavior can be observed: > > - Skype can see /dev/video1 and also provides the USB id > of the camera in the drop down box. After starting camera test, > it takes some seconds for the camera to turn on (it's blue led > comes on) but no picture comes through and CPU usage jumps to > 100% permanently while there is no video at all as long as I > do not stop the camera test. > > - Camorama simply says it cannot open /dev/video1 and that's it.
That's pretty normal, as camorama supports v4l1 only. > - luvcview works seamlessly, as many times I want! Even after the > above applications have failed to open the camera, luvcview always > works even afterwards, both with ehci-hcd enabled and without! > > Does luvcview use some hack/fix/kludge that makes it work? Not that I know of. > What makes this difference that it works while other apps don't? Skype might be buggy ;-) I know that Skype tries to change the frame rate while streaming. The driver currently allows that but doesn't handle the request properly. It might make the webcam crash. I plan to fix it, probably by disallowing frame rate changes while streaming. Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
