** 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1441305/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
