Yep, it's been something slightly short of a circus act : ) It does still occur, but not nearly as often as it used to. The new lock screen in 14.04 is much better than the one in 13.10 - I just tried locking the screen a dozen times in a row with no issue, and I've probably only seen the issue occur 2-3 times since I installed 14.04 (I blew away my old/other linux installs and fresh installed 14.04 the day it came out, looks like that was the 17th of April). I believe the times that it did re-occur, I had my screen locked overnight and when I came back to work in the morning, a terminal window in the second monitor had gone off screen (it was the only window on that screen). This actually happened to me this morning when I came in (May 30th, 2014).
The process I go through every night is: 1) lock the screen with Super + L, 2) turn off the monitors manually (push the physical power button). When I come in in the morning, I push the power buttons back on, and the lock screen is always there. I can then put in my password to unlock and get working. The first thing I usually run is 'sudo apt-get update' and 'sudo apt-get dist-upgrade' in a terminal to be sure I've got the latest packages and updates. In a potentially related issue, I can't reliably use the inactivity screen shutdown on my monitors - I have to set the 'System Settings'->'Brightness and Lock'->'Turn screen off when inactive for' to 'Never', otherwise my monitors will never come back once they've started sleeping (clicking or typing or running 'xset dpms force on' via ssh - I have to reboot the computer). I also have problems occasionally with my left monitor not coming on during a reboot - I sometimes have to power it off and power it on manually before the Ubuntu login screen will recognize it and drive the display. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1257327 Title: 10de:06fd [Dell Precision T5500] Ubuntu 13.10 dual monitor screen lock causes windows to disappear off-screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1257327/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs