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[Bug 1598534] [NEW] Screen can't get back occasionally after dimmed and locked

To: dx-packages@xxxxxxxxxxxxxxxxxxx
From: t4eg <1598534@xxxxxxxxxxxxxxxxxx>
Date: Sun, 03 Jul 2016 05:57:05 -0000
Reply-to: Bug 1598534 <1598534@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Public bug reported:

Reproducibility: Occasionally

Steps to reproduce:
System Settings > Brightness & Lock > 
Dim screen to save power > Check > Turn screen off when inactive for: > 1 minute >
Lock > ON > Lock screen after: > screen turns off

Wait for a few minutes away from my keyboard and mouse.
Then move the mouse.

Actual results:
Screen is still dark except a mouse cursor is displayed and can move as usual.
tty1 is completely dark too.

Expected results:
Screen is displayed.

This problem still exists in latest kernel:
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2016-07-02-yakkety/
In this latest kernel, however, tty1 is displayed as usual.

Ubuntu 16.04 64bit (up to date)
Kernel release:    4.4.0-28-generic
Manufacturer:      NEC
Product Name:      PC-LS150MSB
Firmware Version:  NOTE BIOS Version /740A0800

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Package changed: compiz-plugins-main (Ubuntu) => ubuntu

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https://bugs.launchpad.net/bugs/1598534

Title:
  Screen can't get back occasionally after dimmed and locked

Status in Ubuntu:
  New

Bug description:
  Reproducibility: Occasionally

  Steps to reproduce:
  System Settings > Brightness & Lock > 
  Dim screen to save power > Check > Turn screen off when inactive for: > 1 minute >
  Lock > ON > Lock screen after: > screen turns off

  Wait for a few minutes away from my keyboard and mouse.
  Then move the mouse.

  Actual results:
  Screen is still dark except a mouse cursor is displayed and can move as usual.
  tty1 is completely dark too.

  Expected results:
  Screen is displayed.

  This problem still exists in latest kernel:
  http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2016-07-02-yakkety/
  In this latest kernel, however, tty1 is displayed as usual.

  Ubuntu 16.04 64bit (up to date)
  Kernel release:    4.4.0-28-generic
  Manufacturer:      NEC
  Product Name:      PC-LS150MSB
  Firmware Version:  NOTE BIOS Version /740A0800

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