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[James Lewis <1294079@xxxxxxxxxxxxxxxxxx>]

I switched to the Proprietary AMD/ATI driver and the X server locked up
after I unlocked the screen... at the point where it would have powered
off & back on with the Open Source driver.  I have not been able to
replicate this on a freshly installed machine so I believe it must be a
side effect of upgrading from 13.10.  I don't know if upgrading now will
still generate this issue, but this machine was upgraded to 14.04 some
time ago.

I notice someone else has confirmed this issue, can you say if you did a
fresh install or upgraded, and when you upgraded?

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https://bugs.launchpad.net/bugs/1294079

Title:
  New Lock Screen in 14.04 disables power management

Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  It appears that there are some power management issues related to the
  new lock screen in 14.04...

  To me, it appears that the screen never goes to sleep while displaying
  the lock screen, yet when I unlock it the screen often immediately
  goes to sleep and is then woken back up because I'm now using it.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-desktop 1.321
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Mar 18 11:50:52 2014
  InstallationDate: Installed on 2013-10-25 (143 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: ubuntu-meta
  UpgradeStatus: Upgraded to trusty on 2014-01-17 (59 days ago)

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