Screen Energy Saving and Dim Screen do not work reliably
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
kubuntu-meta (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
(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:/
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
ProcVersionSign
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_
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: kubuntu-meta
UpgradeStatus: Upgraded to vivid on 2015-05-04 (71 days ago)
Really, no one else has this problem. FWIW, it's not a hardware problem. If I run:
sudo sh -c 'vbetool dpms off; read ans; vbetool dpms on'
Then the screen turns off and then turns back on when I hit enter. (See http:// askubuntu. com/questions/ 62858/turn- off-monitor- using-command- line ) So, there must be a problem in some higher level piece of software .