external monitor not working anymore

roger marcus

Honorable
Sep 26, 2013
2
0
10,510
Just started having the same problem - external screen that used to work, doesn't anymore. It is detected and properly describ
 

stillblue

Honorable
Nov 30, 2012
1,163
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11,660

Have you plugged the monitor into another system to make sure it works?
Have you checked to make sure that you didn't accidently deactivate it with the fn keys?
 

roger marcus

Honorable
Sep 26, 2013
2
0
10,510
I use the monitor on a second linux system - it works fine. I used the 'select' display port on the screen to switch between the two systems (both Ubuntu 12.04). It was working for the last six months. The laptop is a macbook running the Ubuntu 12.04. It is a miniport -> displayport cable. I just can't select the display port anymore.