There is more than one issue in this bug.
As far as I know, the new gspca drivers are v4l2 drivers.
We need libv4l package for compatibility with v4l (eg to use camorama).
For avb there is a quality problem (probably related to the driver).
And there is some v4l2 incompatibilites.
I can use v4l2 with mplayer  :
mplayer -fps 15 tv:// -tv  driver=v4l2:device=/dev/video1

But gstreamer-properties don't want to use Video for Linux 2 as Video Default 
Input :
Video for Linux 2 (v4l2): Could not negotiate format
(gstreamer-properties:29563): GStreamer-WARNING **: pad v4l2src3:src returned 
caps which are not a real subset of its template caps
gstreamer-properties-Message: Error running pipeline 'Video for Linux 2 
(v4l2)': Could not negotiate format [gstbasesrc.c(2436): gst_base_src_start (): 
/pipeline0/v4l2src3:
Check your filtered caps, if any]

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webcams stop working with 2.6.27
https://bugs.launchpad.net/bugs/267522
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