On second thought, I guess this may be by design.
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https://bugs.launchpad.net/bugs/1337886
Title:
xset -q intermittently reports wrong DPMS stats
Status in “x11-xserver-utils” package in Ubuntu:
New
Bug description:
###
### What I do
###
I have a simple script running in the background that every second
checks the output of `xset -q` for the current monitor state. However,
every couple days the output is erratic. The script runs as a regular
unprivileged user. I am not sure if the error occures when the monitor
is blanked or active.
To work around the problem I am restarting the xset command in the
script until it comes back with proper output, yet unsure if that
solves the problem though.
###
### What I expect (only showing last couple lines since the others are fine):
###
DPMS (Energy Star):
Standby: 300 Suspend: 450 Off: 600
DPMS is Enabled
Monitor is On
###
### What I actually get
###
The problem is INTERMITTENT and I do not have a good method to
reproduce it, apart from waiting/retrying ...
DPMS (Energy Star):
Standby: 0 Suspend: 0 Off: 0
DPMS is Disabled
Notice how:
- the last line "Monitor is ..." is missing;
- the numbers have changed from couple hundreds seconds to 0
###
### My environment
###
€ lsb_release -rd
Description: Ubuntu 14.04 LTS
€ apt-cache policy x11-xserver-utils
x11-xserver-utils:
Installed: 7.7+2ubuntu1
Candidate: 7.7+2ubuntu1
Version table:
*** 7.7+2ubuntu1 0
500 http://nl.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
100 /var/lib/dpkg/status
€ uname -a
Linux diablo 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: x11-xserver-utils 7.7+2ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Jul 4 16:30:08 2014
InstallationDate: Installed on 2013-08-13 (324 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: x11-xserver-utils
UpgradeStatus: Upgraded to trusty on 2014-04-26 (69 days ago)
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