monitors are duplicated after update

Question

I'm running Ubuntu 16.04 using a dual monitor setup.

Every once in a while I update my system via apt-get update followed by apt-get upgrade.

After reboot the first monitor is duplicated to the second one. When I go to System settings -> Display and monitor and I click on the info button both displays show the same input source (HDMI), which is obviously wrong.

Any ideas on how to resolve this problem?

score 0 · Answer 1 · answered Feb 21 '17 at 11:39

0

The actual name should be Screen Display and not Display and monitor as this shows:

In the middle of the window uncheck the option that says Mirror Displays.

It has happened to me before where extended displays mysteriously changed to mirrored. However it's been a long time since this has happened and it's only ocurred once or twice since upgrading to 16.04 in August 2016.

answered Feb 21 '17 at 11:39

WinEunuuchs2Unix

102,282

Hi, thx for your input. I didn't specify that I'm running KDE 5.5.5 and for some reason this option is not available to me – Mike Dooley Feb 21 '17 at 11:48
answered my own question. thx for your help though! – Mike Dooley Feb 21 '17 at 11:52
Actually I suspected you weren't running Unity because it was called "Display and monitor" and you have "HDMI" option which doesn't appear on my screen. – WinEunuuchs2Unix Feb 21 '17 at 11:52

score 0 · Answer 2 · edited Apr 13 '17 at 12:24

0

I was able to solve it with the help of this answer: https://askubuntu.com/a/91250

I just executed the xrandr commands for my specific setting and it seems to work again.

edited Apr 13 '17 at 12:24

Community

1

answered Feb 21 '17 at 11:51

Mike Dooley

113

monitors are duplicated after update

2 Answers2