Ok, the workaround works, I had troubles because I tried the ppa xorg-
edgers dirvers to see if they fix the thing...

So with the Ubuntu's official repositories, and disabling the
modesetting with the kernel parameter options (I am not sure wether the
ForceEnablePipeA option is required) seems very effective.

However this bug is still problematic because :

    * It makes KMS unusable
    * The newer releases of xorg intel driver seem to require KMS, so if this 
is not fixed upstream there will be a problem with no workaround for future 
Ubuntu releases...

-- 
[i855GM] Lid close with intel 82852/855GM provokes black screen, loss of 
control and overheat
https://bugs.launchpad.net/bugs/462939
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