[Bug 1040714] [NEW] Welcome screen won't display on 2012-08-22 daily iso (amd64 desktop)

[Seth Forshee]

Public bug reported:

I'm testing the desktop-amd64 daily iso from 2012-08-22.

Image: http://cdimage.ubuntu.com/daily-live/20120822/quantal-desktop-
amd64.iso

I've attempted to boot this on 3 machines with both Intel and AMD
graphics. On all machines I get to the Ubuntu splash screen with the
colored dots followed by a blank screen. The welcome screen does not
display. If I interrupt boot using F6 and select the "Try Ubuntu ..."
option I can get to the live desktop just fine.

>From some light debugging I did it looks like when lightdm tries to
start X, X exits with the following:

[    16.385] (EE) Screen(s) found, but none have a usable configuration.
[    16.385] 
Fatal server error:
[    16.385] no screens found

There seems to be another X process already running, so perhaps this is
related.

I'm attaching a full set of logs (from /var/log) for a failed boot.

** Affects: casper (Ubuntu)
     Importance: Critical
         Status: New

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https://bugs.launchpad.net/bugs/1040714

Title:
  Welcome screen won't display on 2012-08-22 daily iso (amd64 desktop)

Status in “casper” package in Ubuntu:
  New

Bug description:
  I'm testing the desktop-amd64 daily iso from 2012-08-22.

  Image: http://cdimage.ubuntu.com/daily-live/20120822/quantal-desktop-
  amd64.iso

  I've attempted to boot this on 3 machines with both Intel and AMD
  graphics. On all machines I get to the Ubuntu splash screen with the
  colored dots followed by a blank screen. The welcome screen does not
  display. If I interrupt boot using F6 and select the "Try Ubuntu ..."
  option I can get to the live desktop just fine.

  From some light debugging I did it looks like when lightdm tries to
  start X, X exits with the following:

  [    16.385] (EE) Screen(s) found, but none have a usable configuration.
  [    16.385] 
  Fatal server error:
  [    16.385] no screens found

  There seems to be another X process already running, so perhaps this
  is related.

  I'm attaching a full set of logs (from /var/log) for a failed boot.

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