Hi, On Thursday 24 June 2010 00:16:18 seno wrote: > Laurent Pinchart <laurent.pinchart <at> ideasonboard.com> writes: > > > show only about half of the real picture (or even less). > > > > Could you post a screenshot ? Does that happen at all resolutions ? > > I did some tests and it happens at all resolutions except 1280x1024; at > least the image is centered at that resolution. > > I put an object in front of the notebook and took a screenshot in linux and > w7, without moving anything between the screenshots, resolution was set to > 640x480 each time. > > http://img10.imageshack.us/img10/1583/bisoncam640x480w7.png > http://img706.imageshack.us/img706/7683/uvc640x480mdv20100.png
Thanks. [snip] > > Could you please send me the output of 'lsusb -v -d 0402:5606' ? I've got > > a copy already, but the BIOS update might have modified it. > > Uploaded here (looks same as one that has been previously posted here): > > http://www.loaditup.de/files/509608.txt Thank you. The descriptors expose pan, tilt and zoom controls. That looks a bit weird for an integrated webcam. Could you try to modify them and see if they have any influence on the picture ? > > The "Camera requested null bandwidth" error message shouldn't be an issue, > > at least if the camera has a single alternate setting like the model I > > know bout has. This can be checked with the lsusb output. > > > > The "Failed to query" messages definitely indicate a firmware bug. It > > might or might not be related to the bad picture issue you have. Would you > > be able to capture a USB trace on Windows if required ? > > Today I noticed again a poor webcam performance in Linux, while I get max. > 7 fps at full sun exposure, the video runs smooth in win 7, even at lower > exposure (at least 15 fps). Furthermore, the image is more bright and sharp > on Windows, but I would be happy if I can get a full sized output at all. Do you get 15 fps in Windows in 1280x1024 ? The camera seems to capture a full resolution image even when you select a lower resolution, and that might have an influence on the frame rate. > If required, I can capture a USB trace on win 7 (would SysNucleus USBTrace > be a good software for that? (Have already installed it) As long as you can export the data in a text-based format, I think that's fine. You can ignore the video transfers (isochronous), but I'll need all control transfers from as early as possible until you start the video capture. As the camera is integrated in the laptop the initialization sequence performed at bootup won't be easy to capture, but with a little luck that won't be needed. Let's first check if the pan/tilt and zoom controls have any influence on the image. -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
