Bug#585016: Logitech QuickCam 4000 Pro USB webcam does not work on Debian Squeeze. It works on Debian Lenny.

[Jean-Christian de Rivaz <jc@eclis.ch>]

Le 14. 01. 11 19:02, Ben Hutchings a écrit :
> On Fri, Jan 14, 2011 at 06:02:44PM +0100, Jean-Christian de Rivaz wrote:
> > Le 14. 01. 11 17:44, Ben Hutchings a écrit :
> > > On Fri, Jan 14, 2011 at 04:49:26PM +0100, Jean-Christian de Rivaz wrote:
> > > > I have experienced this bug today on a AMD64 Squeeze machine and the
> > > > same webcam. The Webcam work perfectly on the Lenny machines, but do not
> > > > outputs any image on Squeeze, unless you remove the pwc.ko module and
> > > > replug the camera.
> > > >
> > > > There is a trace of what happens while the pwc.ko in inserted fir the
> > > > first time into the kernel:
> > > [...]
> > >
> > > Which version of vgrabbj did you use?
> > >
> > > Ben.
> >
> > vgrabbj 0.9.6
> [...]
>
> I mean the *package* version (dpkg -s vgrabbj).

Oops! Sorry for the misunderstanding. Here is the details:

dpkg -s vgrabbj
Package: vgrabbj
Status: install ok installed
Priority: optional
Section: graphics
Installed-Size: 116
Maintainer: Michael Janssen <jamuraa@debian.org>
Architecture: amd64
Version: 0.9.6-3.2
Depends: ftplib3 (>= 3.1), libc6 (>= 2.7), libjpeg62 (>= 6b1), 
libpng12-0 (>= 1.2.13-4), libv4l-0 (>= 0.5.0), zlib1g (>= 1:1.1.4)
Conffiles:
 /etc/vgrabbj.conf e49a78bfbf7a9884737538ea426fd76b
Description: grabs a image from a camera and puts it in jpg/png format
 vgrabbj is a program that will grab an image from a v4l compatible
 device (usually a webcam of some sort) and save it in a jpg or png
 file.
Homepage: http://vgrabbj.gecius.de/

More experiments show that the pwc.ko insertion do a working job half of 
the time. I am now able to get a proper video with VLC if I do this:

1) rmmod pwc.
2) plug the webcam.
3) gst-launch v4l2src ! ffmpegcolorspace ! xvimagesink
4) terminate the gstreamer process.
5) vlc v4l2:///dev/video0

This did not work right if I do not start gstreamer before vlc. Anyway 
gstreamer and cheese always show strange green images. I also notices 
that vlc can work one a single time with v4l instead of v4l2. After that 
the pwc.ko seem to be frozen as when is go wrong while linked to the kernel.

Jean-Christian