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
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