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I'm using Raspberry Pi B+ V1.2 with Raspbian. Is there any way of changing the gamma/contrast/brightness of an LCD monitor via Raspberry Pi?

My Samsung 960BF doesn't have any hardware adjustment, only a power button.

I tried using xbacklight and got error:

"No outputs have backlight property".

gddccontrol also didn't work. Error:

I/O warning: failed to load external entity "/home/pi/.dccontrol/monitorlist"  
   Document not parsed successfully
   Probing for available monitors"

And nothing is happening.

I connected my monitor through DVI-HDMI cable. Maybe this is why it doesn't work?

Giacomo1968
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tarzanno
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1 Answers1

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One tool I have used successfully (not on a pi though), is xcalib from the package of the same name. You can use it to change the gamma, eg:

xcalib -gc 1.1 -a

You can repeat this. To cancel use

xcalib -clear

Another useful option is making the whole screen reverse-video:

 xcalib -invert -a

It is intended to work with icc profiles, but I have only used the above commands.

meuh
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