Public bug reported:
I am running an HP 455 G2 Laptop, AMD A series A8-7100 1.8 GHz, 4GB RAM,
500GB HDD, 15.6" Display, DVDRW, AMD Radeon R5, Webcam, Bluetooth with
Ubuntu 16.04; upgraded from 15.10.
Under 15.10 I connected and used an acer vga monitor. After the upgrade
to 16.10 the second monitor has no display.
Steps to reproduce:
Disconnect monitor; restart computer.
Enter "Screen Display". confirm only one (internal) monitor is shown.
Connect monitor. Click "detect displays". Monitor is detected and shown in
grey (screenshot 1)
Select acer monitor; click "on" at slider. (screenshot 2)
Click "Apply". No display on acer monitor. Click "Keep this configuration".
Still no display on acer monitor, however mouse is not held at edge of laptop
screen - ie the computer thinks the external display is in use. Also windows
can be pushed entirely into the extended desktop (but are then, obviously, not
visible).
The little indicator light on the monitor switch remains in the amber "no
signal" condition.
Now click "power > shut down > shut down" As computer shuts down the purple
screen with line of dots lighting up appears on BOTH the built in screen AND
the external screen.
On restart, the computer still thinks the external screen exists and is active,
but there is no display.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity-control-center 15.04.0+16.04.20160413-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Tue May 3 10:19:01 2016
ExecutablePath: /usr/bin/unity-control-center
InstallationDate: Installed on 2016-02-26 (66 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
ProcEnviron:
PATH=(custom, no user)
SHELL=/bin/bash
LANG=en_GB.UTF-8
LANGUAGE=en_GB:en
XDG_RUNTIME_DIR=<set>
SourcePackage: unity-control-center
UpgradeStatus: Upgraded to xenial on 2016-04-22 (10 days ago)
** Affects: unity-control-center (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1577701
Title:
Cannot use external monitor
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