Ubuntu
casper package

  1. Bug #1489147
  2. Comment #13

Comment 13 for bug 1489147

Revision history for this message
Karl Kastner (kastner-karl) wrote :

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