Ubuntu: Unable to access display settings GUI


I recently plugged an old monitor to my laptop and it doesn't display red color. I want to configure it, but when i open Configuration > Settings > Displays (I hope my translation is accurate; in fact I work in Spanish) it doesn't allow me to change display settings. It says -I'm translating- "Unable to retrieve screen information". I attach a screenshot. I hope this isn't a duplicated issue; I've searched carefully and could not find anything similar.




Old monitors (CRTs) used 3 guns (RGB) to create the images and didn't send configuration data back to the system like current screens do.

I've seen this particular problem before. It's quite likely that the Red gun in your CRT is shot and so no Red will be displayed. You can confirm this by trying to display orange which if I'm correct will display green.

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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