Cannot change display settings

Question

I go to the Settings :

Then I click on the Displays tab under Hardware category and get the following:

I am afraid cannot fix it up.

Edit: Output of xrandr

Edit 2: The gnome-shell DE was able to read the display information what the Unity DE couldn't:

Solution 1

I had the exact same issue on 15.04,I managed to resolve it by installing unity-control-center.

I guess somewhere down the line I had messed it up or removed it.

Try reinstalling it if its already there....

sudo apt-get install unity-control-center

Solution 2

Maybe Its a bug,Gnome is full of it, try to do this in terminal (Ctrl+Alt+T):-

mutter --replace

Otherwise you can replace the Gnome Desktop Environment. Try to install another environment. By the way, can you tell me your Ubuntu version?

=>EDIT=<

Ok, Try to do this:-

xrandr --addmode VIRTUAL1 1366x768_59.8
xrandr --output VGA --mode 1366x768_59.8

Comments

[solsTiCe]

what is the output of xrandr in a terminal ?

[ashubuntu]

@solsTiCe: see edit section of the post.

[solsTiCe]

What do you want to change ? then look at man page of xrandr for that...

[Jacob Vlijm]

There is a file: ~/.config/monitors.xml. possibly (most likely) for some reason, the file is corrupted and unreadable. Try removing/renaming the file, log out and back in. Then try again using System Settings.

[Jacob Vlijm]

@solsTiCe apart from setting the monitor, OP probably would like to solve the problem of not being able to do so from GUI.

[Jacob Vlijm]

Ashubuntu, could you give some feedback on the answer(s)? Would be useful to understand what works or not.

[ashubuntu]

@JacobVlijm When I logged into my machine using the Unity DE, I got that problem in the first place. Then I installed gnome-shell and logged in, now I get the normal case. See Edit 2 Section. I guess my Unity DE is somehow broken.

[ashubuntu]

Desktop Environment is Unity, Ubuntu 15.04

[Sharad Gautam]

Are you using laptop or pc? And how many monitors/projectors are you using?

[ashubuntu]

I did as you said and got my problem partially solved. If you look at the screen-shot I added in Edit 2, you will notice that at the right there is Dell Inc. 19 and at the left there is the default 15.04 background with the number 1 pinned on it. This time my machine can read the screen information Dell Inc. 19 at the right but cannot output the background at the left that I have changed from default ubuntu 15.04 to another one.

[Pramod Kharade]

@Ajinkya Patil Thanks! same issue , I was facing.