Solved! Via Tweaks disabled Nautilus as Desktop Manager let Unity freeze hard on Window Minimize!!
Solution enable Nautilus a Desktop Manager ! Crazy Dependency!!! 01-2016 ** Changed in: compiz (Ubuntu) Status: New => Confirmed ** Also affects: nautilus (Ubuntu) Importance: Undecided Status: New ** Also affects: unity (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/1529382 Title: Unity on Vivid freeze thru Compiz since fresh setup (Intel+NVIDIA +Nouveau-Kernel 3+4) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1529382/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp