[vlc] --video-x and --video-y not working on linux

[gonzague]

Hi all, i've up a post in the forum but it looks no one is interested in 
: http://forum.videolan.org/viewtopic.php?f=13&t=76135#p310913
I need to position my video window on one of my screens.
For this i use "vlc --video-x=100 --video-y=100 ", it perfectly works on 
windows but not on linux .
Test have been done on Ubuntu 10.04 LTS with vlc stable 1.1.11 and  vlc 
1.2.0-git Twoflower (revision 1.1.0-pre1-4373-g3ae42e7) compiled by myself.

Does anyone find a solution other than running your linux without window 
manager ?

Thanks