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I'm probably missing something here. I'm using the default Ubuntu power manger, I set it up like this:

  • On AC: no screen dimming when idle, never put computer to sleep, never put display to sleep.
  • On battery: I kept the default settings.

Still, Ubuntu does whatever it likes, and after 15 min it puts the display to sleep.

Does anyone have the same problem and found a way to solve it? I'm using an Eee PC with Ubuntu 10.10 Desktop.

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No, don't have that problem. A week idea: Is there a BIOS-setting? – user unknown Mar 1 '11 at 15:45
tried that out, there is no power management options in the bios. – david25 Mar 1 '11 at 16:36
Does it help at all if you click the Make Default button in Power Management Preferences? Also, what is the output of cat /proc/acpi/ac_adapter/AC/state? – ændrük Mar 1 '11 at 19:30
cat gave me: cat: /proc/acpi/ac_adapter/AC/state: No such file or directory , and make default didn't help either – david25 Mar 1 '11 at 21:46
sorry about the late answer, i did found out what the problem is, it is a BIOS setting that i still don't have an idea how to change, will post if i will find how to change it – david25 Aug 13 '11 at 10:59

I had the same problem, after ages of searching what might be the problem i found out that it was the screen saver. I believe it was by default set to go black after 15 minutes, it had nothing to do with the power management just go to system > screensaver to disable it

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Check the "Action" tab in "OnAC" tab, which sets the screen to sleep mode after 10 minutes and power off after 15 minutes.

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