Hi Satz, On Saturday 19 June 2010 16:22:27 Satz Klauer wrote: > > I have a strange problem here with a Logitech C200 webcam. > > Using a standard Fedora 13 system with a kernel 2.6.33.5-112.fc13.i686.PAE > the uvcvideo-module detects everything correctly: > > uvcvideo: Found format YUV 4:2:2 (YUYV). > uvcvideo: - 640x480 (30.0 fps) > uvcvideo: - 160x120 (30.0 fps) > uvcvideo: - 176x144 (30.0 fps) > uvcvideo: - 320x240 (30.0 fps) > uvcvideo: - 352x288 (30.0 fps) > uvcvideo: - 640x360 (30.0 fps) > uvcvideo: - 640x400 (30.0 fps) > > Now I have second system with a stripped down Fedora 8 and a handmade > vanilla kernel 2.6.33.5. There uvcvideo is not able to detect the maximum > resolution of 640x480, the trace output only gives me some resolutions: > > uvcvideo: Found format YUV 4:2:2 (YUYV). > uvcvideo: - 160x120 (15.0 fps) > uvcvideo: - 176x144 (15.0 fps) > > What's going on here, what could be the reason for these problems?
My guess is that the first system as an EHCI (USB 2.0) controller, while the second has an OHCI/UHCI (USB 1.1) controller. Less bandwidth, smaller frame sizes. -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
