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

** Summary changed:

- Lightdm causes black screen upon boot (monitor off)
+ Black screen on boot (no signal)

** Description changed:

  Recently, the following problem appeared suddenly:
  
  - Start computer
  - Ubuntu splash screen appears with dots
- - Monitor turns black and switches off
+ - Screen turns black and switches off (no signal)
  
  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
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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

Title:
  Black screen on boot (no signal)

Status in lightdm package in Ubuntu:
  New

Bug description:
  Recently, the following problem appeared suddenly:

  - Start computer
  - Ubuntu splash screen appears with dots
  - Screen turns black and switches off (no signal)

  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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