Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

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) : The xset 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 with xset s off did not change the behavior.

How do I stop this annoying screen blanking?

share|improve this question
add comment

1 Answer 1

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 of xset q included:

    DPMS (Energy Star):
      Standby: 33    Suspend: 49    Off: 66
      DPMS is Enabled
      Monitor is On
    

which explains the 33 seconds. Enabling and disabling “Screen Energy Saving” as described above reset this to:

DPMS (Energy Star):
  Standby: 21600    Suspend: 32400    Off: 43200
  DPMS is Disabled

presumably the command xset -dpms or xset dpms off would have fixed the problem in the same way.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.