Addendum:

Booting the previous 3.13.0-6-generic will continue to boot but shows the 
"firmwre not responding" error briefly.
The update that triggered the regression was:

Start-Date: 2014-02-06  11:56:33
Commandline: apt-get -y upgrade
Upgrade: libdpkg-perl:i386 (1.17.5ubuntu2, 1.17.5ubuntu3), libfontembed1:i386 
(1.0.44-1, 1.0.44-2), abiword-common:i386 (3.0.0-2ubuntu1, 3.0.0-4), 
ubuntu-standard:i386 (1.315, 1.316), dpkg:i386 (1.17.5ubuntu2, 1.17.5ubuntu3), 
libcupsfilters1:i386 (1.0.44-1, 1.0.44-2), libabiword-3.0:i386 (3.0.0-2ubuntu1, 
3.0.0-4), libgirepository-1.0-1:i386 (1.39.3-0ubuntu1, 1.39.3-0ubuntu2), 
dpkg-dev:i386 (1.17.5ubuntu2, 1.17.5ubuntu3), libevview3-3:i386 
(3.10.3-0ubuntu2, 3.10.3-0ubuntu3), gir1.2-freedesktop:i386 (1.39.3-0ubuntu1, 
1.39.3-0ubuntu2), xserver-common:i386 (1.15.0-1ubuntu1, 1.15.0-1ubuntu2), 
cups-filters:i386 (1.0.44-1, 1.0.44-2), linux-libc-dev:i386 (3.13.0-7.25, 
3.13.0-7.26), xserver-xorg-video-intel:i386 (2.99.907-0ubuntu2, 
2.99.909-0ubuntu2), evince-common:i386 (3.10.3-0ubuntu2, 3.10.3-0ubuntu3), 
abiword:i386 (3.0.0-2ubuntu1, 3.0.0-4), gir1.2-glib-2.0:i386 (1.39.3-0ubuntu1, 
1.39.3-0ubuntu2), linux-image-extra-3.13.0-7-generic:i386 (3.13.0-7.25, 
3.13.0-7.26), linux-image-3.13.0-7-generic:i386 (3.13.0-7.25, 3.13.0-7.26), 
dh-python:i386 (1.20131021-1ubuntu8, 1.20140128-1ubuntu1), ubuntu-minimal:i386 
(1.315, 1.316), evince:i386 (3.10.3-0ubuntu2, 3.10.3-0ubuntu3), 
libevdocument3-4:i386 (3.10.3-0ubuntu2, 3.10.3-0ubuntu3), 
cups-filters-core-drivers:i386 (1.0.44-1, 1.0.44-2)
End-Date: 2014-02-06  11:59:37

During upgrade this warning appeared twice:

dkms: WARNING: Linux headers are missing, which may explain the above failures.
      please install the linux-headers-3.13.0-7-generic package to fix this.

Even though there were no further failures in the log I installed linux-
headers-3.13.0-7-generic manually afterwards.

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https://bugs.launchpad.net/bugs/1272720

Title:
  sometimes boot fails

Status in “libpciaccess” package in Ubuntu:
  New
Status in “xorg-server” package in Ubuntu:
  New

Bug description:
  Probably not an Xorg problem:

  Lubuntu Trusty 
  Linux xxxxxx 3.13.0-5-generic #20-Ubuntu SMP Mon Jan 20 19:58:23 UTC 2014 
i686 athlon i686 GNU/Linux

  CPU: dual core turion

  1) sometimes i have to start lightdm manually
  2) sometimes a big freeze during boot, even before attempting loading X . 
(reboot needed)
  3) sometimes kernel complains about CPU-firmware missing.
  4) sometimes b43 wlan hardware not detected

  Sorry I can't be more clear  about this.
  Half of the times it is booting perfectly.
  It feels like a racecondition somewhere ( module? / kernel? ).

  Since this bug report was automagically generated by apport I hope you
  guys can make any sense of it.

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-core 2:1.14.5-1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  Uname: Linux 3.13.0-5-generic i686
  ApportVersion: 2.13.1-0ubuntu2
  Architecture: i386
  CrashCounter: 1
  Date: Sat Jan 25 18:03:23 2014
  ExecutablePath: /usr/bin/Xorg
  InstallationDate: Installed on 2014-01-04 (21 days ago)
  InstallationMedia: Lubuntu 14.04 "Trusty Tahr" - Alpha i386 (20140102)
  ProcCmdline: /usr/bin/X -core :0 -auth /var/run/lightdm/root/:0 -nolisten tcp 
vt7 -novtswitch
  ProcEnviron:
   
  Signal: 6
  SourcePackage: xorg-server
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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