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
Status in xserver-xorg-video-nouveau package in Ubuntu:
Fix Released
Bug description:
Xorg crashes when a Lenovo P50 laptop is undocked, disconnecting it
from two external DisplayPort monitors.
This is an upstream bug which exists in the latest Git revision (ac8f7b949e50
at time of writing):
https://bugs.freedesktop.org/show_bug.cgi?id=106994
Full backtrace:
Thread 1 "Xorg" received signal SIGSEGV, Segmentation fault.
drmmode_output_dpms (output=0x558b2dab8ee0, mode=3) at
../../src/drmmode_display.c:921
921 ../../src/drmmode_display.c: No such file or directory.
#0 0x00007f386322a759 in drmmode_output_dpms (output=0x558b2dab8ee0, mode=3)
at ../../src/drmmode_display.c:921
drmmode_output = 0x558b2dab8cc0
koutput = 0x0
props = <optimized out>
drmmode = 0x558b2dab5200
mode_id = -1
i = 0
#1 0x0000558b2ba39223 in xf86DisableUnusedFunctions (pScrn=0x558b2dab4930)
at ../../../../../../hw/xfree86/modes/xf86Crtc.c:3000
output = <optimized out>
xf86_config = 0x558b2dab56e0
o = 6
c = <optimized out>
#2 0x0000558b2ba40ef0 in xf86RandR12CrtcSet (pScreen=<optimized out>,
randr_crtc=0x558b2daf51f0, randr_mode=0x0, x=0, y=0, rotation=<optimized out>,
num_randr_outputs=0, randr_outputs=0x0)
at ../../../../../../hw/xfree86/modes/xf86RandR12.c:1245
pScrn = 0x558b2dab4930
config = <optimized out>
crtc = 0x558b2dab9ec0
transform = 0x0
changed = <optimized out>
o = <optimized out>
ro = <optimized out>
save_crtcs = 0x558b2debcc50
save_enabled = <optimized out>
#3 0x0000558b2ba84a32 in RRCrtcSet (crtc=<optimized out>, mode=0x0, x=0,
y=0, rotation=rotation@entry=1, numOutputs=numOutputs@entry=0, outputs=0x0) at
../../../../randr/rrcrtc.c:768
pScreen = 0x558b2daacb80
ret = <optimized out>
crtcChanged = <optimized out>
o = <optimized out>
#4 0x0000558b2ba862b3 in ProcRRSetCrtcConfig (client=0x558b2de43170) at
../../../../randr/rrcrtc.c:1366
stuff = <optimized out>
rep = {type = 0 '\000', status = 0 '\000', sequenceNumber = 0, length
= 0, newTimestamp = 766260624, pad1 = 21899, pad2 = 735925696, pad3 = 21899,
pad4 = 1660946009, pad5 = 32568}
pScreen = <optimized out>
crtc = 0x558b2daf51f0
mode = 0x0
numOutputs = 0
outputs = <optimized out>
time = <optimized out>
rotation = 1
ret = <optimized out>
i = <optimized out>
j = <optimized out>
status = <optimized out>
#5 0x0000558b2b9c0e98 in Dispatch () at ../../../../dix/dispatch.c:479
result = <optimized out>
start_tick = 930
#6 0x0000558b2b9c4ee0 in dix_main (argc=3, argv=0x7ffdc0d05ac8,
envp=<optimized out>) at ../../../../dix/main.c:287
i = <optimized out>
alwaysCheckForInput = {0, 1}
#7 0x00007f3865d7db97 in __libc_start_main (main=0x558b2b9aeb50 <main>,
argc=3, argv=0x7ffdc0d05ac8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffdc0d05ab8) at ../csu/libc-start.c:310
result = <optimized out>
unwind_buf =
{cancel_jmp_buf = {{jmp_buf = {0, 837132253956422676,
94056220388192, 140727838333632, 0, 0, 6878053941391146004,
6843373089882258452}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0,
0x7f3868887733 <_dl_init+259>, 0x7f3868875438}, data = {prev = 0x0, cleanup =
0x0, canceltype = 1753773875}}}
not_first_call = <optimized out>
#8 0x0000558b2b9aeb8a in _start ()
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