I tested the most recent kernel from the drm-next-4.15-dc branch found at: https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-4.15-dc (commit b175d392cfb28a9d260904bbb330917efe039331 ) The problem with my 5K display still persists. Has there been any update on this issue?