Re: #114. In the bug 90401 at bugs.freedesktop.org (https://bugs.freedesktop.org/show_bug.cgi?id=90401) I was pointed to the xf86-video-intel page http://cgit.freedesktop.org/xorg/driver/xf86 -video-intel/. Building and installing this got rid of the flashing lights, unusable display, etc and seems to have fixed the bug I saw.
** Bug watch added: freedesktop.org Bugzilla #90401 https://bugs.freedesktop.org/show_bug.cgi?id=90401 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1432194 Title: Graphics unstable on Ubuntu 14.04 and 14.10 using Intel HD Graphics 5500 To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1432194/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs