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[Launchpad Bug Tracker <1789913@xxxxxxxxxxxxxxxxxx>]

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 <tjaalton@xxxxxxxxxx>  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)

Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server-hwe-16.04 package in Ubuntu:
  Invalid
Status in xorg-server source package in Xenial:
  Won't Fix
Status in xorg-server-hwe-16.04 source package in Xenial:
  Fix Released
Status in xorg-server source package in Bionic:
  Fix Released
Status in xorg-server-hwe-16.04 source package in Bionic:
  Invalid

Bug description:
  [Impact]
  X server crashes in certain cases on I+A hybrid machines with modesetting+amdgpu drivers.

  [Test case]
  Connect an external monitor, check that it doesn't crash X.

  [Regression potential]
  This commit was provided by AMD and reviewed by an NVIDIA engineer, and after a few iterations it got applied upstream. We'll test it with many driver combinations (modesetting+amdgpu, m+nvidia, m+m...) to check that they all (still) work.

  
  --

  Copied from a private bug:

  - Steps to see the issue:
  1. Connect a monitor to UUT via HDMI port
  Expected Result:
    Video outputs successfully in the monitor
  Actual Result:
    X crashes into a login screen

  - BIOS: 0.7.3
  - AMD driver release: 18.10, 18.20RC8 and 18.20RC9

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