I confirm that this problem affects me too. I have not been able to reproduce it at my will, but it recurs manytimes.
1. Black screen upon login after a long screen lock period (2-3 hours or more). 2. Black screen upon removal of second monitor (from either VGA or HDMI port). 3. Issue more likely to occur when switching from a browser tab with flash or youtube running. Sometimes from presentation screen. Hardware: Lenovo B40-80 (intel i3-5005, 4GB DDR3 RAM, Broadwell-U Integrated graphics controller) Software: Elementary 0.4, using processor microcode firmware for intel CPUs (proprietary). This problem persisted with the default driver too. The screen sometimes rapidly flickered (falsely rendering alternate screens or white screens for few milliseconds). With a change in graphics driver also, this issue has remained. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1320989 Title: black screen after longer screen lock To manage notifications about this bug go to: https://bugs.launchpad.net/elementaryos/+bug/1320989/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
