Back after some more testing. To summarise: my problem is not related to 
hybernation or suspension, just closing the lid (or hitting the close lid 
button) makes the system hang.
One funny thing is that the screen goes black (not blank) except for the mouse 
pointer!

1.) If I plug in a second monitor to the VGA connector, the blanking on
lid close is disable, and this problem disappears. Is it possible to
forcibly disable the screen blanking even when no external monitor is
attached?

2.) I've tried xserver-xorg-video-intel_2.1.1-0ubuntu10~pcjc2.2_i386.deb
, but it doesn't help me: my system still lock as soon as I close the
lid.

3.) The system hangs even when I'm running only KDM, so it shouldn't be
related to Compiz & company.

How should I go on debugging ?

-- 
xserver-xorg-video-intel hangs the system when laptop lid is closed
https://bugs.launchpad.net/bugs/138256
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