From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mailout-de.gmx.net ([213.165.64.23]:59461 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751743Ab1LKL7l (ORCPT ); Sun, 11 Dec 2011 06:59:41 -0500 Message-ID: <4EE49B2B.8090502@gmx.de> Date: Sun, 11 Dec 2011 12:59:39 +0100 From: Johannes Bauer MIME-Version: 1.0 To: linux-media@vger.kernel.org Subject: zc3xx webcam crashes on in-focus pictures Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Hi list, the problem I'm having sounds really weird and strange, please bear with me -- I do not know who else to ask or what to search for. I have a Logitech Labtec webcam: Bus 001 Device 012: ID 046d:08a2 Logitech, Inc. Labtec Webcam Pro Which I use with the zc3xx driver on a 2.6.34 Linux: usb 1-3.2: new full speed USB device using ehci_hcd and address 12 gspca: probing 046d:08a2 zc3xx: probe sensor -> 000e zc3xx: Find Sensor PAS202B input: zc3xx as /devices/pci0000:00/0000:00:1a.7/usb1/1-3/1-3.2/input/input7 gspca: video0 created gspca: found int in endpoint: 0x82, buffer_len=8, interval=10 gspca: probing 046d:08a2 gspca: probing 046d:08a2 I'm using mplayer for playback. This works nicely for the most part. However, as soon as I get things in focus (or make images of things that have sharp edges), the driver chokes -- mplayer just displays v4l2: select timeout And no more frames appear. As soon as I put the pictures back out of focus, frames are updated again. I've noticed this problem about a year back when I tried automatic recognition of QR codes with that camera. Since QR codes basically consist ONLY of sharp edges (black/white), the camera totally choked upon shown one. Back then I ditched the whole project and found another solution. Now I just tried to hook the camera up to my microscope for fun. As a test image, I made an image of a ruler. It worked pretty nicely, but you guessed it: As soon as I put the image in focus, the camera chokes. Has anyone ever heared of a similar problem with that driver? Or may that even be a hardware fault? Lastly, can anyone recommend a high-quality webcam that runs smoothly on Linux? Best regards, Joe