laptop does not suspend automatically after inactivity in 14.04.2 with home folder encrypted

[atsjiedel]

Laptop does not suspend automatically after inactivity time in ubuntu mate 14.04.2 LTS with home folder encrypted.
The suspend mode works well when I close the lid, so it's not a specific suspend feature problem.

How to reproduce:
- Do a clean installing of ubuntu mate 14.04.2 chosing to encrypt home folder during instalation
- Run ubuntu mate and configure Power Management to make the computer sleep after inactive for X minutes
- Wait X minutes
- Nothing will happens.

The problem is with this dconf setting:
org -> mate -> power-manager -> action-sleep-type-battery = hibernate (default value).

But... as we know, when the home folder is encrypted, hibernate feature is automatically disabled by ubuntu.
So, after the inactivity time is expired, nothing happens. Problably it tries to hibernate but as it is not possible it does nothing.

other possibly problematic configurations if you have your home folder encrypted and can't hibernate:
action-critical-battery = hibernate (default value)
action-low-ups = hibernate (default value)

WORKAROUND:
Run dconf-toos as administrator and manually changes all configs above to suspend (or something else except hibernate)

After making this fixes in dconf, the sleep function is working fine.