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[Bug 1434372] Re: [Lenovo E555] Screen of laptop will become black and never lighting after un-plug VGA cable

 

Gabriel Zhi Chen, thank you for reporting this and helping make Ubuntu better. Could you please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1434372

Please ensure you have xdiagnose installed, and that you click the Yes
button for attaching additional debugging information.

** Package changed: linux-lts-utopic (Ubuntu) => xorg (Ubuntu)

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1434372

Title:
  [Lenovo E555] Screen of laptop will become black and never lighting
  after un-plug VGA cable

Status in HWE Next Project:
  New
Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  CID: 201408-15472 Lenovo E555 (A+A) with 14.04.2 (utopic)

  Steps:
  1. Install 14.04.2 on E555
  2. Install fglrx
  3. Reboot system and log in 
  4. Plug in a VGA cable and switch 4 modes by display key. (external, internal, extand and mirror)
  5. Un-plug VGA cable, observe screen result.

  Expected results:
  Labtop screen display normally.

  Actual result:
  Labtop screen became black and never lighting. Only press power button off/on machine, that could make screen light again.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: boot/vmlinuz-3.16.0-30-generic]
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar 19 23:58:26 2015
  InstallationDate: Installed on 2015-03-18 (1 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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