laptop does not suspend when lid is closed

suddenly my laptop did not suspend when i closed the lid. i checked all settings of my linux mint 17 installation and all settings where correct. a quick search pointed me to http://askubuntu.com/questions/395428/laptop-does-not-suspend-when-lid-is-closed.

the solution for me was to edit /etc/systemd/logind.conf, changing the option HandleLidSwitch to suspend (valid options are suspend, hibernate and poweroff) and reboot the machine.

beep on suspend hibernate

lately i was wondering why my laptop was beeping when going to hibernate or suspend mode .. it turned out that i decreased the volume pushing the volume-minus button until (i thought) it would be mute …

but you have to push the mute button to mute the laptop .. minimizing the volume does not result in mute (like in windows) but beep sounds …