Now i think, that this problem is related to the graphic chipset /
driver: I am able to switch to a tty blindly, log in there and execute
command "sudo halt". So the system is still running, but the screen is
"dead".
I cannot reproduce the issue if i run my system in "low graphic mode"
(by introducing an error in /etc/X11/xorg.conf).
My systems graphic card: Intel GMA4500M
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
Kernel driver in use: i915
Kernel modules: i915
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named switch user does not allow to return to current user
https://bugs.launchpad.net/bugs/577219
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