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[grga ptic <0.gl.gl.gl.gl.0@xxxxxxxxx>]

Public bug reported:

Recently, the following problem appeared suddenly:

- Start computer
- Ubuntu splash screen appears with dots
- Monitor turns black and switches off

This happened on every boot. Previously I had removed all but the latest
kernel [linux-lts-trusty (3.13.0-48.80~precise1]), but this may be a
coincidence because that kernel started without problems before.

Note 1: My OS starts from an SSD.
Note 2: The same problem also appeared at the same time on Ubuntu 14.04 LTS 64 bit installed on a different SSD on the same computer. However, there the black screen only appears on every *first* boot. The second boot will be fine.

I could not even start my computer in recovery mode, as it hung after
mounting additional HDDs (may be related or not). In the end I was able
to start it in text mode by adding "nomodeset" to the GRUB boot options.

Switching the display manager to gdm then fixed the problem for me.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lightdm 1.2.3-0ubuntu2.7
ProcVersionSignature: Ubuntu 3.13.0-48.80~precise1-generic 3.13.11-ckt16
Uname: Linux 3.13.0-48-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: amd64
Date: Tue Apr  7 20:43:44 2015
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130214)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise running-unity

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1441305

Title:
  Lightdm causes black screen upon boot (monitor off)

Status in lightdm package in Ubuntu:
  New

Bug description:
  Recently, the following problem appeared suddenly:

  - Start computer
  - Ubuntu splash screen appears with dots
  - Monitor turns black and switches off

  This happened on every boot. Previously I had removed all but the
  latest kernel [linux-lts-trusty (3.13.0-48.80~precise1]), but this may
  be a coincidence because that kernel started without problems before.

  Note 1: My OS starts from an SSD.
  Note 2: The same problem also appeared at the same time on Ubuntu 14.04 LTS 64 bit installed on a different SSD on the same computer. However, there the black screen only appears on every *first* boot. The second boot will be fine.

  I could not even start my computer in recovery mode, as it hung after
  mounting additional HDDs (may be related or not). In the end I was
  able to start it in text mode by adding "nomodeset" to the GRUB boot
  options.

  Switching the display manager to gdm then fixed the problem for me.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: lightdm 1.2.3-0ubuntu2.7
  ProcVersionSignature: Ubuntu 3.13.0-48.80~precise1-generic 3.13.11-ckt16
  Uname: Linux 3.13.0-48-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  Date: Tue Apr  7 20:43:44 2015
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130214)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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