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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)

** Affects: hwe-next
     Importance: Medium
     Assignee: Liming Wang (wangliming)
         Status: New

** Affects: xorg (Ubuntu)
     Importance: Medium
     Assignee: Liming Wang (wangliming)
         Status: Incomplete


** Tags: 201408-15472 amd64 apport-bug beijing-lab blocks-hwcert trusty
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[Lenovo E555] Screen of laptop will become black and never lighting after un-plug VGA cable
https://bugs.launchpad.net/bugs/1434372
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