I have a samsung series 9 (900X the old model) and also suffer from the issue. The problem is related to the suspend since I can reproduce it by closing the lid or by suspending via the top right menu.
Additionally, the workaround described here of disable the lock on suspend stuff doesn't work for me, neither the one of locking beforeclosing the lid. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1283938 Title: Ubuntu 14.04 blank screen after wakeup from sleep To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1283938/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs