Thanks a lot for the answer, Christopher!
I apologize for the old BIOS.
Although even after update (
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
0705
12/05/2013
)
the problem persists (as well as the "ACPI: BIOS _OSI(Linux) query ignored" 
message, should I tweak the BIOS somehow?).
I should also notice it's not 100% reproducible. Sometimes everything works, 
sometimes login takes several minutes. Sometimes it just crashes and I get back 
to my session.

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https://bugs.launchpad.net/bugs/1265016

Title:
  Cannot switch user session

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