To narrow down the problem, I installed KDM.
Normal login: problems.
Recovery mode, drop to root shell, kdm start: no problems.

So GDM or KDM are not at the origin of the problem, the bug occurs
before.

Actually, you can sometimes see some graphic distorsion on the splash
screen already.

-- 
[To Be Filled By O.E.M. To Be Filled By O.E.M.] late resume failure Ubuntu 
freezes after login. Fine horizontal stripes on the login screen indicate a 
graphics problem. Mouse still moves but doesn't respond. Reboot by 
Alt+PrintScreen+B necessary. Workaround: log into a recovery session, fallback 
to root shell with network, gdm start, login normally, no problem will occur.
https://bugs.launchpad.net/bugs/479339
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