The bug have been reported upstream:
https://bugs.freedesktop.org/show_bug.cgi?id=108514

https://forums.linuxmint.com/viewtopic.php?t=229387
suggest the bug could be "fixed" by creating 
/usr/share/X11/xorg.conf.d/20-radeon.conf with:

Section "Device"
        Identifier "Radeon"
        Driver "radeon"
        Option "AccelMethod" "glamor"
        Option "TearFree" "on"
EndSection

Someone could try?

** Bug watch added: freedesktop.org Bugzilla #108514
   https://bugs.freedesktop.org/show_bug.cgi?id=108514

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https://bugs.launchpad.net/bugs/1791312

Title:
  ubuntu 18.04 flickering screen with Radeon X1600

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