I've recently installed Ubuntu 15.04 on my Acer Aspire V3, along with pre-installed Win8.1. During installation, I enabled /home encryption. There is no problem with suspending laptop for the first time, but if I try to suspend it one more time or turn it off - it freezes. It seems to be connected with this encryption, since when I try "sudo shutdown now", terminal prints "Please enter passphrase for disk…". After giving right password, the problem disappears.
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Change your title. – A.B. Apr 24 '15 at 18:36
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Perhaps it is encryption. It will be hard to determine for it probably happens with awake. Dunno but it might have something to do with this post [Why doesn't running “sudo shutdown now” shutdown?](https://askubuntu.com/questions/578144/why-doesnt-running-sudo-shutdown-now-shutdown). – VRR Apr 24 '15 at 21:41
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systemd-tty-ask-password-agent eliminates the problem too. Can it be used automatically - I mean via dialog and so on? – user1433733 Apr 25 '15 at 17:03