Public bug reported:

Occasionally, the internal laptop display goes black for a few seconds,
then comes back to life. The external display stays on. It looks as if
power management were kicking in by error but affecting only the
internal display.

When I’m working with the external display, I need to move the mouse
into the area managed by the internal display to wake it up again; else
it seems to remain black (though I haven’t tested that behavior
thoroughly).

Most tests with the external display were made with the port replicator
and an external display plugged into one of the DP ports via a DP–DVI
adapter. I cannot tell for sure what the behavior is with the external
display plugged directly into the laptop.

The hard disk was originally installed with Ubuntu MATE 14.10 in a HP
EliteBook 6930p, upgraded to 15.04, 15.10 and eventually 16.04 and
finally moved to the EliteBook 840 G1.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-93.116-generic 4.4.79
Uname: Linux 4.4.0-93-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: MATE
Date: Fri Sep  8 00:53:24 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-12-09 (1002 days ago)
InstallationMedia: Ubuntu MATE 14.10 "Utopic Unicorn" - amd64 (20141023)
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1715749

Title:
  Intermittent black screen on HP EliteBook 840 G1

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