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[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

What stacktrace?

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https://bugs.launchpad.net/bugs/1518021

Title:
  /usr/bin/Xorg:6:sna_dri2_event_free:sna_dri2_schedule_flip:sna_dri2_schedule_swap:DRI2SwapBuffers:ProcDRI2SwapBuffers

Status in xf86-video-intel:
  Incomplete
Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  This occurs on my shiny new Lenovo Thinkpad T540p.

  I have my laptop docked in a Lenovo UltraDock running two external
  1080p displays.

  When I'm logged in, if I un-dock the laptop I get booted back out to
  the login screen (i.e.- X crashes). This seems to happen about 90% of
  the time, so it's reasonably easy to reproduce.

  In order to try and reproduce this, I installed the X server -dbg
  packages. However, with the -dbg packages installed I can't seem to
  reproduce this  any more (possibly a race condition?).

  ---

  The Ubuntu Error Tracker has been receiving reports about a problem
  regarding xorg-server.  This problem was most recently seen with
  version 2:1.17.2-1ubuntu9, the problem page at
  https://errors.ubuntu.com/problem/e58accb723690ba7801e7f3fbc9bc637f08e8641
  contains more details.

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