Unable to access display settings GUI

Question

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.

Thanks.

Screenshot

score 0 · Accepted Answer · answered Oct 10 '16 at 22:23

0

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.

answered Oct 10 '16 at 22:23

Elder Geek

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Yes, you are correct. It may be a hardware issue, but when i unplug it i cannot configure my laptop screen anyway. Any guess? – Munir Hachemi Guerrero Oct 10 '16 at 22:26
did you search for an answer to that question? – Elder Geek Oct 10 '16 at 22:28
If your certain your screen supports other resolutions and you know what they are your answer is here: http://askubuntu.com/questions/377937/how-to-set-a-custom-resolution – Elder Geek Oct 10 '16 at 22:34
Yes, I did. In Spanish i googled the literal message and in English i tried to guess the translation. I found out that i can configure some options via 'xrandr', but I would want to do it through the grafic interface. – Munir Hachemi Guerrero Oct 10 '16 at 22:35
Once you add supported resolutions via cvt and xrandr I think you'll find that you can. – Elder Geek Oct 10 '16 at 22:41
Hello. I did it and it is still not working. – Munir Hachemi Guerrero Oct 10 '16 at 22:55

Unable to access display settings GUI

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