Lock screen keeps making sound when screen is off

Posted by row1 on Super User See other posts from Super User or by row1
Published on 2012-11-10T04:33:45Z Indexed on 2012/11/10 5:03 UTC
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I have my laptop (Asus UL20FT) on external power and hooked up to an external monitor. I keep the laptop lid closed and am using the 'second screen only' option. If you leave it on the lock screen for a short period of time the screen powers off. While the screen is off it keeps repeating a "duuuh duh duh" sound (sounds just like the device plugged in sound).

The monitor is connected via HDMI and I have Microsoft and Logitech wireless USB dongles plugged in.

How can I prevent this sound loop?

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