This bug was fixed in the package xorg-server-hwe-16.04 -
2:1.19.6-1ubuntu4.1~16.04.1
---------------
xorg-server-hwe-16.04 (2:1.19.6-1ubuntu4.1~16.04.1) xenial; urgency=medium
* prime-sync-refactor.diff: Fix crash on modesetting+amdgpu hybrid.
(LP: #1789913)
-- Timo Aaltonen <tjaal...@debian.org> Wed, 05 Sep 2018 14:31:56 +0300
** Changed in: xorg-server-hwe-16.04 (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1789913
Title:
X crashes with "randr: falling back to unsynchronized pixmap sharing"
when connecting to an external monitor via HDMI (I+A)
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