Hi Aurel, On Monday 14 January 2008, Aurel Gabris wrote: > Hi all, > > I have a ViewSonic monitor that has a built-in webcam. It appears as a usb > device, with ID 04f2:b021. Some other Chicony webcams are tagged as > supported but this one isn't. Yet, I've come across only one previous > posting about this webcam: he was given advice on how to load the module. > He didn't reply to that advice, so we don't know if it worked for him or > not... > > I have successfully compiled and configured my uvc module, but not > everything is working. > > I can use luvcview and have pretty good picture. There are some error > messages with each frame, also the produced jpeg has "Invalid SOS > parameters for sequential JPEG." But it seems these messages can be > ignored.
That's a good start. Not sure about the invalid SOS parameters, it might be a warning only. > However, when I try to use it with amsn things turn more gloomy. If I have > amsn configured to use my old usb webcam (uses gspca) it starts well, and > in the camera selection panel I see the ViewSonic 1.3M webcam, and > selecting it also gives a nice picture -- like in luvcview. But right > after closing this video config window, and at any subsequent start of the > application there seems to be some (re)initialization problem, and amsn no > longer works. It terminates with the following rror messages: > > ioctl: VIDIOC_S_CTRL(id=9963776;value=25536): Input/output error > ioctl: VIDIOC_S_CTRL(id=9963777;value=32768): Input/output error > Not a JPEG file: starts with 0x9a 0x67 > Oops: malloc_video_bufs is 1 (expected 0) > [utils/linux/capture/libng/grab-ng.c:malloc_bufs_check:235] > Oops: processes is 1 (expected 0) > [utils/linux/capture/libng/convert.c:process_check:179] > > The amsn developers say it must be a bug in the driver module, and aren't > very enthusiastic in checking their code. > > I wonder if this is a known problem with this or other webcams? Does > anyone have an idea how to work around this? I'd even be happy to have > some suggestions which applications to use to test the webcam, to be able > to compile more concise bug report... Could you please check the kernel log for error messages generated by the driver ? I would also appreciate if you could post the output of lsusb -v (using usbutils 0.72 or newer). Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
