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I use the inverted colors mode a lot, however after installing ubuntu 12.10 it doesn't work for me any more. The command:

xcalib -i -a

Outputs:

Error - unsupported ramp size 0

I have no clue where to start looking to fix this problem. Couldn't find anything about this error. Any ideas?

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2 Answers 2

Reset to default
4

The gamma ramp is not defined (0), but xcalib expects multiples of 16. Installing gcm solved the issue for me:

sudo apt-get install gnome-color-manager
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  • 1
    Doesn't work for me. Please explain this method, how have you figured out to install gcm? Maybe I find a similar solution for me. I'm using xfce. Inverting works on 3 different monitors, including the notebook's, but doesn't work on a fourth monitor (Samsung S23B350).
    – VasyaNovikov
    Oct 24, 2013 at 6:55
  • Doesn't work for me either on Cinnamon. Used to work until a few weeks ago. Using Debian Stretch, not sure what got updated.
    – Luc
    Jan 21, 2017 at 23:58
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Here's an idea (I had the same problem with Xubuntu 17.10.1, and this solution worked for me): Use the solution provided in Anwar's answer to this question.

Create the following filepath (I had to make the directory called xorg.conf.d, too): /etc/X11/xorg.conf.d/20-intel.conf and add these lines to the file (then save and restart your computer afterward):

Section "Device"
  Identifier "Intel Graphics"
  Driver "intel"
EndSection
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