Both games don't go above 60Hz with resolutions over 1080p on my setup but I
will report this to the devs. Just for the case you like to reproduce the
issue.

With the newest driver version from the Padoka PPA, RX 480 and EIZO FS-2735
flickering happens when the refresh rate is set to 119Hz or 143Hz. (Ingame
settings in Tropico and xrandr for Victor Vran). As far as I remember this
happend also in the beginning, has been fixed at some point(but I am not 100%
sure) and now happens again.

The desktop doesn't suffer the same issue.

OpenGL version string: 3.0 Mesa 17.1.0-devel - padoka PPA