Second monitor blanks at login prompt

Bug #1509596 reported by Robert Navarro on 2015-10-24
This bug affects 2 people
Affects Status Importance Assigned to Milestone
lightdm (Ubuntu)

Bug Description

The system is an Intel NUC D34010WYK with an i3 Hasell processor.

Monitor 1 is connected via micro HDMI
Monitor 2 is connected via mini DisplayPort

At boot BIOS, Grub, systemd, all get mirrored on both screens as expected.

However, once the login prompt hits Monitor 2 (DisplayPort) goes blank. It flickers periodically though.

When it does flicker on I can see the desktop, any windows that got moved to that monitor and the clock is up to date.

The two monitors are exactly the same model, Samsung SyncMaster 204B.

I have tried swapping monitors and the issue seems to persist on the mini DisplayPort connection only.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: lightdm 1.16.4-0ubuntu1
Uname: Linux 4.3.0-994-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Oct 23 20:18:09 2015
InstallationDate: Installed on 2015-10-12 (12 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: lightdm
UpgradeStatus: Upgraded to wily on 2015-10-24 (0 days ago)

Robert Navarro (crshman) wrote :
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lightdm (Ubuntu):
status: New → Confirmed

I am seeing a similar problem with NUC5I7RYH. Both monitors look find at boot-up but one goes blank one you get to the login prompt for X Windows. No flickering. Also on 15.10.

The following worked for me:

1. Install xserver-xorg-video-intel package and rebooting.
This showed output on the second monitor in lower resolution.

2. Adding higher resolution via xrandr:
sudo xrandr --addmode DP1 1920x1080

3. Using the Ubuntu settings, display module to switch to higher resolution.

Changed in lightdm (Ubuntu):
importance: Undecided → Low
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