Ubuntu – Why xcalib invert screen doesn’t work with ubuntu 12.10


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


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?

Best Answer

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