This issue has a workaround:

Download 7.9 radeon driver Ubuntu package (xserver-xorg-video-radeon-
hwe-16.04_7.9.0-0ubuntu1~16.04.1_amd64.deb) from:

Execute the following on the downloaded .deb file:

> sudo dpkg -i xserver-xorg-video-radeon-

> sudo apt-get -f install

> sudo apt-mark hold xserver-xorg-video-radeon-hwe-16.04

This downgrades the radeon driver package to version 7.9, fixes dependencies, 
and holds the driver pkg from further updates.

Upon rebooted, issue is resolved.

A bug has been reported to Freedesktop at:

** Bug watch added: Bugzilla #105217

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