Debian fixed this:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=896979
xserver-xorg-video-nouveau (1:1.0.15-3) unstable; urgency=medium
* Team upload.
* Apply proposed patch to fix a null pointer dereference in
drmmode_output_dpms() (Closes: #896979).
* Cherry-pick commit 69aecdd305d ("modesetting: Validate the atom for
enum properties") from upstream to fix another potential null pointer
dereference.
* Update Vcs-* fields to point at salsa.debian.org.
* Use https in debian/watch.
* Bump debhelper compat level to 11.
- Drop dh-autoreconf from Build-Depends.
- Bump quilt build dependency to (>= 0.63-8.2~) (see #851130).
- Switch from "dh_install --fail-missing" to dh_missing.
* Bump Standards-Version to 4.1.4, no changes needed.
-- Sven Joachim <svenj...@gmx.de> Mon, 25 Jun 2018 18:39:33 +0200
** Bug watch added: Debian Bug tracker #896979
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=896979
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1778086
Title:
Xorg crashes when a Lenovo P50 laptop is undocked
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