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After upgrade to kernel 4.13.16-302 one monitor in a two monitor displayport setup isn't working anymore.

Submitted by torsten@intsec.org

Assigned to Nouveau Project

Link to original bug (#104109)

Description

Created attachment 135975
kernel log (4.13.16-300)

This issue comes in two parts which may be related to each other.
First when upgrading to kernel 4.13.16-300 I began to have issues with one monitor when it went into sleep mode. I then saw errors like "disp: outp 03:0006:0f88: training failed". Checking xrandr showed that the monitor "existed" but it only showed a black screen.
This behaviour was tested on both fedora 27 and ubuntu 16.04 LTS with all updates installed.

The dual monitor setup was working prior to updating to kernel 4.13.16-300.


When doing a kernel upgrade to 4.13.16-302 this monitor was not even found anymore by the nouveau driver.

I will attach the following files:

  • kernel log 4.13.16-300
  • kernel log 4.13.16-302
  • xrandr when running kernel 4.13.16-300
  • xrandr when running kernel 4.13.16-302

    Attachment 135975, "kernel log (4.13.16-300)":
    kernel.log