Bug#873290: Similar problem on Mint Mate 18.2 with Freeciv

[Peter Kuykendall <peterkuykendall@gmail.com>]

I'm having a similar problem with Mint 18.2.  It's triggered by launching freeciv-client-gtk.  

When I boot it's fine.  Open a terminal window, fine.  Open Chrome, fine.  Open Freeciv, the initial screens are OK, but once the full screen game starts, XORG pegs to 100% of a single core, even when nothing is happening.  Closing Freeciv returns XORG to normal.  Screen shots of atop output during all of these test cases are here: https://drive.google.com/open?id=1e15ZaYrxgWcFNRaquUHcTMxZ99_pZDf0

apt-cache policy freeciv-client-gtk

freeciv-client-gtk:

  Installed: 2.5.10-1

  Candidate: 2.5.10-1

  Version table:

 *** 2.5.10-1 500

        500 http://mirror.genesisadaptive.com/ubuntu bionic/universe amd64 Packages

        100 /var/lib/dpkg/statusapt-cache policy xorg

apt-cache policy xorg

xorg:

  Installed: 1:7.7+19ubuntu7.1

  Candidate: 1:7.7+19ubuntu7.1

  Version table:

 *** 1:7.7+19ubuntu7.1 500

        500 http://mirror.genesisadaptive.com/ubuntu bionic-updates/main amd64 Packages

        100 /var/lib/dpkg/status

     1:7.7+19ubuntu7 500

        500 http://mirror.genesisadaptive.com/ubuntu bionic/main amd64 Packages

Please let me know if you need more info.  Thanks - Pete