debian 7.7 - laptop - dconf - changes not accepted

[Ulrich Haas <ullrichhaas@posteo.de>]

Dear all,
I am using debian 7.7 on a lenovo laptop. I assume that after the latest
security-updates in january 2015 - DSA-3125 openssl und DSA-3124 otrs2
-, the laptop changed the behavior when close and open the lid.

Now, after a couple of time of working with it, I closed the lid for a
pause. After the pause, when open the lid again, the laptop starts from
scratch, but I did not shot it down before.

Tried to change the settings in dconf-editor:
dconf-editor/org/gnome/settings-demon/plugins/power/lid-close-ac-action/ .. default = suspsend

The action to change the default 'suspend' to 'blank' was not accepted.

Other changes in dconfig, like ...lid-close-battery-action could be
changed from 'suspend' to 'blank'.

What could I do?

thanks in advacde
ulrich