I have found a way to switch the misbehaviour off:
1. Remove power cable (I have a Lenovo mini dock. Disconnection means
undocking, don't know if this is important)
2. Activate standby (suspend to RAM)
3. Come back from standby.
4. Activate standby (suspend to RAM)
5. Come back from standby.
==> Problem is gone (no more freezes), even when reconnected to power
I tested this with LXDE desktop (from package lubuntu-desktop). I don't
know (yet) if it is working with KDE or Gnome.
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https://bugs.launchpad.net/bugs/711284
Title:
After natty update today, system is unresponsive and freezes often
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