Bug#851810: xcalib: "Error - unsupported ramp size 0" when trying to invert screen

[Rinat Ibragimov]

Found that patch at 
https://lists.x.org/archives/xorg-devel/2017-October/054991.html  
solves the issue, at least for me.

It's a patch for X.Org, not for xcalib package. Xcalib is fine.


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Rinat