This could be the fdo bug at
http://bugs.freedesktop.org/show_bug.cgi?id=26915 , which is fixed
upstream in kernel 2.6.33.7  From the changelog:

commit ce0824b5a9740ac4d18368a224c945a10c680f1c
Author: Alex Deucher
Date:   Sat Mar 6 09:43:41 2010 -0500

    drm/radeon/kms: fix legacy tv-out pal mode
    
    commit ff3f011cd859072b5d6e64c0b968cff9bfdc0b37 upstream.
    
    fixes fdo bug 26915
    
    Signed-off-by: Alex Deucher
    Signed-off-by: Dave Airlie
    Signed-off-by: Greg Kroah-Hartman

A PPA of this kernel is available at 
http://kernel.ubuntu.com/~kernel-ppa/mainline/
Please test if possible.


** Bug watch added: freedesktop.org Bugzilla #26915
   http://bugs.freedesktop.org/show_bug.cgi?id=26915

** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu)

-- 
TV output has stationary horizontal gray stripes
https://bugs.launchpad.net/bugs/584169
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