Upgrade from vivid amd64. Similar problem here. Background light switches on and off every two seconds. Same for external monitor.
CPU: Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz Graphics: GM107M [GeForce GTX 860M] NVIDIA Corporation It is not the kernel, booting an old kernel results into the same problem. Sometimes there are two junk characters on the screen, sometimes the following error message is displayed: [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1489147 Title: Booting live Wily image results in black screen with or without random text To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1489147/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
