From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-bw0-f46.google.com ([209.85.214.46]:34520 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751911Ab1B0MmV (ORCPT ); Sun, 27 Feb 2011 07:42:21 -0500 Received: by bwz15 with SMTP id 15so3039481bwz.19 for ; Sun, 27 Feb 2011 04:42:19 -0800 (PST) Subject: Re: Genuis Emessenger 310 webcam slow work with pac7302 in 2.6.37.1 kernel From: housegregory299 To: linux-media@vger.kernel.org In-Reply-To: <1298810271.4400.43.camel@debian> References: <1298718695.2178.30.camel@debian> <4D693EB3.6080302@freemail.hu> <1298762810.2022.54.camel@debian> <4D6A018E.7090404@freemail.hu> <1298810271.4400.43.camel@debian> Content-Type: text/plain; charset="UTF-8" Date: Sun, 27 Feb 2011 18:42:03 +0600 Message-ID: <1298810523.4788.2.camel@debian> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit List-ID: Sender: В Вск, 27/02/2011 в 18:37 +0600, housegregory299 пишет: > > As I understand the webcam was not working properly even using 2.6.32 > > kernel. > > Yes, this is so. But in near installed Windows 7 webcam also work slow > and picture quality is worse than on Debian with 2.6.37. I think my > webcam very limited functionality. I have to keep both the kernels on my > system - 2.6.32 and 2.6.37 and switch between them on the need. > > > Are you using v4l2ucp for setting exposure value? This command is > > available > > from the v4l2ucp Debian package. Are the other controls working > > properly? > > I use v4l2ucp from command line to saving and loading webcam's > customised parameters, (v4l2ucp -s .webcam and v4l2ucp -l .webcam) > but with other keys are not used. All parameters in Guvcview work fine > and properly, except Exposure. > > > Some more hints for the trying the "test images": make sure that > > v4l-utils > > Debian package is installed ("apt-get install v4l-utils" as root). > > Then > > you can use the command "v4l2-dbg --set-register=0x72 x" where "x" is > > any > > number between 0 and 15. This command has to be executed as root. To > > return > > to the normal operation just use the zero value for x. I'm not sure > > that > > these test patterns will work for your webcam model also, but it would > > be > > interesting to try. > > command "v4l2-dbg --set-register=0x72 10 not help to me: With value 0 > output are similar: > > root@debian:/home/t800# v4l2-dbg --set-register=0x72 10 > Failed to set register 0x00000072 value 0xa: Invalid argument > > But i try setup my webcam with v4l-utils. > > > The main problem is that the manufacturer of the chip which is > > included > > in your webcam neither released programming documentation nor > > implemented > > a standard protocol like USB Video Class. Without documentation open > > source > > projects can only use trial and error > > ( http://en.wikipedia.org/wiki/Trial_and_error ). > > I understand, OK. So.. Which webcam is better suited for Linux systems - > UVC standard ? This is open? or closed? Sorry, if this question is wrong > - i don't know which webcam select for my Linux-system. > > > I would strongly recommend to add the mailing list > > "linux-media@vger.kernel.org" > > in CC field, so more people can see this conversation. > > OK. I do it