This bug was fixed in the package xorg-server - 2:1.19.6-1ubuntu4.1
---------------
xorg-server (2:1.19.6-1ubuntu4.1) bionic; urgency=medium
* prime-sync-refactor.diff: Fix crash on modesetting+amdgpu hybrid.
(LP: #1789913)
* sync-i965-pciids.diff: Update intel pci-id's. (LP: #1789924)
-- Timo Aaltonen <[email protected]> Wed, 05 Sep 2018 14:38:25 +0300
** Changed in: xorg-server (Ubuntu Bionic)
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.
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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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