I have a Lenovo Thinkpad T60 running 12.04.4 LTS, Precise Pangolin; the desktop is KDE. Starting today, the display goes blank after 33 seconds of inactivity. Clicking or even moving the mouse, or pressing a key, resets the 33-second timer.
I have checked the following settings:
- System Settings / Screen Saver Settings (screenshot): These are turned off. Turning them on and setting an explicit timeout of 9 minutes did not change the behavior.
- System Settings / Energy Saving Settings (screenshot): These are turned off. Turning on "Dim Display and setting to 10 minutes did not change the behavior.
-
X server settings (
xset
) : Thexset q
command reported:Screen Saver: prefer blanking: yes allow exposures: yes timeout: 0 cycle: 600
The
timeout: 0
indicates that the X screen saver feature is disabled. Explicitly disabling it withxset s off
did not change the behavior.
How do I stop this annoying screen blanking?
Best Answer
The problem was in the DPMS settings. These are settable in two places:
Under System Settings / Configure Energy Saving Settings / Screen Energy Saving. (Screenshot). Enabling this and then disabling it again fixed the problem.
Under the X server DPMS settings, accessible through
xset
. The output ofxset q
included:which explains the 33 seconds. Enabling and disabling “Screen Energy Saving” as described above reset this to:
presumably the command
xset -dpms
orxset dpms off
would have fixed the problem in the same way.