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For a way too strange reason, my TV (which I'm using with a Dell Inspiron 1145 laptop running Ubuntu 11.10) does not allow me to do a fine-grained brightness configuration. Therefore, I'm looking for a way to configure this using Ubuntu by itself.

I've found a lot of articles/forum posts describing how to this, but all the solutions were related to notebooks.

Is there a way to configure my Tv/Monitor brightness without using its own controls?

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2 Answers 2

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I've used to use xgamma, from terminal:

myuser@mypc:~$ xgamma -gamma 0.8

I suppose the default gamma value is 1.0 (you can set greater values to brighter...). As far as I remember, the value is reset when you start a new session.

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Hey, if you're using a NVIDIA's card and it is installed the NVIDIA X Server Settings, you're able to change the gamma (and contrast, and brightness) value through this graphical config software, in "X Server Color Correction" option. –  YuriC Jun 13 '12 at 23:39
    
Unfortunately, I'm not using NVIDIA drivers. The xgamma approach worked. However, the image become a little bit weird for values < 0.6. Any tip on that? Thank you very much, anyway :-) –  Herberth Amaral Jun 14 '12 at 3:21
    
You can test it by changing each color separately (Red, Green and Blue), have a look on xgamma manual (rgamma, ggamma and bgamma options). Maybe the weirdness go away after adjusting it. =) And gamma correction is not the same of brightness and contrast, but I don't know a way of changing these properties yet. –  YuriC Jun 14 '12 at 17:41

Assuming it's the same as 12.04

System Settings -> Brightness and Lock

And adjust the slider.

Unless I'm missing something?

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In theory, you're right. But this only works for laptops' monitors. –  Herberth Amaral Jun 14 '12 at 1:05

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