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I would like to have my screen fully powered at all times, but it goes to standby once I lock my PC.

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up vote 5 down vote accepted

Open your System Settings. We need to make changes to Power and Brightness & Lock settings.

System Settings

Power Settings

Change the value of Suspend when inactive for to Don't suspend.

Power Settings

Brightness & Lock Settings

Change the value of Turn screen off when inactive for to Never.

Brightness & Lock Settings

This should help to achieve your desired result.

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Thanks. For my particular issue (my speakers which were powered by the monitor would turn off when the screen gets locked) I just had to disable a setting of the display itself. Still, this answers the question I asked. – Andreas Hartmann Sep 25 '13 at 13:02

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