[Bug 1474534] [NEW] Screen Energy Saving and Dim Screen do not work reliably

[Leon Maurer]

Public bug reported:

(The following is a bug I reported to KDE some time ago, but no one has
replied and it may be a Kubuntu problem rather than a KDE problem. I'm
not sure where the problem is, so I just chose the kubuntu-meta package.
The KDE bug report is at https://bugs.kde.org/show_bug.cgi?id=349344 )

The Power Management module in KDE system settings has an options named
Screen Energy Saving (which is meant to put the screen into power saving
mode when not in use) and Dim Screen (which is supposed to dim the
screen after inactivity).

However, neither of them work reliably. Even with the Screen Energy
Saving option enabled, the screens will usually not go into power saving
mode. I have observed this on three computers (one laptop, two desktops)
with a total of 5 monitors. For reasons I don't understand, sometimes it
works -- usually on my laptop screen, but sometimes on screens attached
to the desktops. However, in the vast majority of cases, nothing happens
and the screen stays on.

The Dim screen option on my laptop is also unreliable. Sometimes it does
not dim. Sometimes it does. Sometimes, after dimming or putting the
screen into energy saving mode, the laptop screen will not undim.

I haven't figured out a pattern to any of this. These features worked
before I upgraded to Kubuntu 15.05 and KDE 5.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: kubuntu-desktop 1.323
ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Jul 14 15:01:28 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-06-05 (1134 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kubuntu-meta
UpgradeStatus: Upgraded to vivid on 2015-05-04 (71 days ago)

** Affects: kubuntu-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages vivid

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Title:
  Screen Energy Saving and Dim Screen do not work reliably

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