Ubuntu
xorg package

  1. Bug #1570653
  2. Comment #57

Comment 57 for bug 1570653

Revision history for this message
madbiologist (me-again) wrote : Re: 4K Monitor not detected properly

Goldstar is the old name of the LG corporation.

The problem is logged in your dmesg.txt:

[ 10.609475] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery reached max voltage
[ 10.609494] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed

This probably also causes the later:

[ 46.014534] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed: 5 tries
[ 46.014557] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed

 Does this issue still occur with the latest Xenial 4.4.0-45.66 kernel?