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[Luzius Thöny <lucius.antonius@xxxxxxxxx>]

Happens to me using Xubuntu 15.10 on a Lenovo Thinkpad laptop with the
proprietary Nvidia drivers. The external projector is a Sony (not sure
about the exact type). I can open nvidia-settings, but the projector is
not recognized. When I click on "Detect Display", it crashes immediately
with a segfault.

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https://bugs.launchpad.net/bugs/1462432

Title:
  100% reproducible segfault clicking "detect displays"

Status in nvidia-settings package in Ubuntu:
  Confirmed

Bug description:
  When I click "Detect displays", nvidia-settings segfaults.

  The nvidia driver doesn't seem particularly happy with having more
  than one monitor attached anyway (weird flashing during boot), but it
  does work if configured manually with xrandr.  i3wm without gnome-
  session or any compositor running.

  Full stacktrace from a custom build of the package (make X_CFLAGS=-g), for debug symbols:
  (gdb) bt
  #0  0x00007ffff6b9f13f in poll_for_next_event (c=0x0, queued=queued@entry=0) at ../../src/xcb_in.c:633
  #1  0x00007ffff6b9f1b7 in xcb_poll_for_event (c=<optimised out>) at ../../src/xcb_in.c:647
  #2  0x00007ffff78d5db8 in poll_for_event (dpy=dpy@entry=0x995720) at ../../src/xcb_io.c:257
  #3  0x00007ffff78d5efe in poll_for_response (dpy=dpy@entry=0x995720) at ../../src/xcb_io.c:289
  #4  0x00007ffff78d61dd in _XEventsQueued (dpy=dpy@entry=0x995720, mode=mode@entry=2) at ../../src/xcb_io.c:363
  #5  0x00007ffff78c8207 in XPending (dpy=0x995720) at ../../src/Pending.c:55
  #6  0x00000000004166ce in NvCtrlEventHandlePending ()
  #7  0x00007ffff641c7da in  () at /usr/lib/libnvidia-gtk3.so.346.59
  #8  0x00007ffff41f83fd in g_main_context_prepare (context=context@entry=0x694810, priority=priority@entry=0x7fffffffe090)
      at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3410
  #9  0x00007ffff41f8de8 in g_main_context_iterate (context=0x694810, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimised out>)
      at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3788
  #10 0x00007ffff41f9242 in g_main_loop_run (loop=0x109df40) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4002
  #11 0x00007ffff5d03d15 in gtk_main () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
  #12 0x000000000040802b in main ()

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: nvidia-settings 346.59-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  Date: Fri Jun  5 17:03:45 2015
  InstallationDate: Installed on 2014-08-01 (308 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: nvidia-settings
  UpgradeStatus: Upgraded to vivid on 2014-09-11 (267 days ago)

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