Bug 104109

Summary: After upgrade to kernel 4.13.16-302 one monitor in a two monitor displayport setup isn't working anymore.
Product: xorg Reporter: torsten
Component: Driver/nouveauAssignee: Nouveau Project <nouveau>
Status: NEW --- QA Contact: Xorg Project Team <xorg-team>
Severity: major    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: Linux (All)   
i915 platform: i915 features:
Description Flags
kernel log (4.13.16-300)
kernel log (4.13.16-302)
xrandr output
xrandr output none

Description torsten 2017-12-05 14:14:37 UTC
Created attachment 135975 [details]
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
Comment 1 torsten 2017-12-05 14:15:41 UTC
Created attachment 135976 [details]
kernel log (4.13.16-302)
Comment 2 torsten 2017-12-05 14:16:20 UTC
Created attachment 135977 [details]
xrandr output
Comment 3 torsten 2017-12-05 14:19:05 UTC
Created attachment 135978 [details]
xrandr output

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.