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[Robert Thornton <robert.p.thornton@xxxxxxxxx>]

I get exactly this same behavior on my Lenovo w520 laptop ever since
14.04.1. There appears to be nothing wrong with the nvidia drivers. The
driver hasn't changed and neither has my xorg.conf since the update. If
I boot without my external display connected, then after a few seconds I
hear the ubuntu "drums" sound event that normally plays whenever the
login screen is displayed, but the login screen doesn't show on the
built-in display. Only the purple boot screen displays. If I connect my
external display, I do see the login screen. Once I authenticate with my
external display connected, my built-in display will display the
desktop. I've re-installed 14.04 at least 3 times, and I keep getting
this behavior. The only way I've been able to avoid it is to NOT do the
updates, and that's a security problem.

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https://bugs.launchpad.net/bugs/1332963

Title:
  laptop with docking station hangs on purple boot screen if booted
  without dock

Status in “compiz” package in Ubuntu:
  Confirmed

Bug description:
  I'm using Ubuntu 14.04 and I'm updating my packages as often as
  possible.

  Since the last update (posted some lines from the dpkg.log below) my laptop, which is usually attached to a docking station with two external monitors, only works if it is booted while in the dock.
  When I boot the laptop without sitting in the dock, the screen of the laptop stays in the purple boot screen of ubuntu. If I put the laptop back into the dock, the two external monitors automatically display the login screen (the purple screen stays on the laptop's screen).
  Also interesting: If the system is booted and the laptop is in the dock (output is shown on both screens), I can remove the laptop and the output switches to the laptop screen automatically.

  Before those updates I was able to boot the laptop with or without
  being attached to the dock. Also it was no problem to plug it in and
  remove it from the dock while running. The system always automatically
  switched between the "laptop-only-mode" and the "dual-external-screen-
  mode".

  Laptop HW:
  Lenovo T420
  Nvidia NVS 4200M / Intel HD 3000 (Optimus)

  Here are some lines of the dpkg.log where I think they belong to the
  update which causes those problems:

  2014-06-21 00:19:05 upgrade udev:amd64 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:07 upgrade libudev1:i386 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:08 upgrade libudev1:amd64 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:08 upgrade libpam-systemd:amd64 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:09 upgrade systemd-services:amd64 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:10 upgrade libsystemd-daemon0:amd64 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:10 upgrade libsystemd-login0:amd64 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:11 upgrade libgudev-1.0-0:i386 1:204-5ubuntu20.2 1:204-5ubuntu20.3
  2014-06-21 00:19:12 upgrade libgudev-1.0-0:amd64 1:204-5ubuntu20.2 1:204-5ubuntu20.3
  2014-06-21 00:19:12 upgrade libspectre1:amd64 0.2.7-2ubuntu1 0.2.7-2ubuntu1.1
  2014-06-21 00:19:13 upgrade ubuntu-drivers-common:amd64 1:0.2.91.5 1:0.2.91.6
  2014-06-21 00:19:14 upgrade libsystemd-journal0:amd64 204-5ubuntu20.2 204-5ubuntu20.3
  2014-06-21 00:19:15 upgrade libcompizconfig0:amd64 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:15 upgrade compiz-plugins:amd64 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:16 upgrade compiz-gnome:amd64 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:17 upgrade compiz-plugins-default:amd64 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:18 upgrade libdecoration0:amd64 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:19 upgrade compiz-core:amd64 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:20 upgrade compiz:all 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:20 upgrade gir1.2-gudev-1.0:amd64 1:204-5ubuntu20.2 1:204-5ubuntu20.3
  2014-06-21 00:19:21 upgrade gnome-sudoku:all 1:3.10.2-0ubuntu3 1:3.10.2-0ubuntu3.1
  2014-06-21 00:19:25 upgrade network-manager-gnome:amd64 0.9.8.8-0ubuntu4.1 0.9.8.8-0ubuntu4.2
  2014-06-21 00:19:27 upgrade libnm-gtk0:amd64 0.9.8.8-0ubuntu4.1 0.9.8.8-0ubuntu4.2
  2014-06-21 00:19:27 upgrade libnm-gtk-common:all 0.9.8.8-0ubuntu4.1 0.9.8.8-0ubuntu4.2
  2014-06-21 00:19:28 upgrade libtar0:amd64 1.2.20-3 1.2.20-3ubuntu0.1
  2014-06-21 00:19:28 upgrade nvidia-common:amd64 1:0.2.91.5 1:0.2.91.6
  2014-06-21 00:19:29 upgrade thunderbird-locale-de:amd64 1:24.5.0+build1-0ubuntu0.14.04.1 1:24.6.0+build1-0ubuntu0.14.04.1
  2014-06-21 00:19:30 upgrade thunderbird-locale-en:amd64 1:24.5.0+build1-0ubuntu0.14.04.1 1:24.6.0+build1-0ubuntu0.14.04.1
  2014-06-21 00:19:30 upgrade thunderbird:amd64 1:24.5.0+build1-0ubuntu0.14.04.1 1:24.6.0+build1-0ubuntu0.14.04.1
  2014-06-21 00:19:33 upgrade thunderbird-locale-en-gb:all 1:24.5.0+build1-0ubuntu0.14.04.1 1:24.6.0+build1-0ubuntu0.14.04.1
  2014-06-21 00:19:34 upgrade thunderbird-locale-en-us:all 1:24.5.0+build1-0ubuntu0.14.04.1 1:24.6.0+build1-0ubuntu0.14.04.1
  2014-06-21 00:19:34 upgrade compiz-plugins-main:all 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:35 upgrade compiz-plugins-main-default:all 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:35 upgrade compizconfig-backend-gconf:all 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:36 upgrade python-compizconfig:amd64 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1
  2014-06-21 00:19:36 upgrade compizconfig-settings-manager:all 1:0.9.11+14.04.20140423-0ubuntu1 1:0.9.11.1+14.04.20140617-0ubuntu1

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