Laptop keeps making device connect and Device disconnect sound.

My windows 8 laptop(IdeaPad U310) keeps making this device connect and disconnect noises.
I have hooked my laptop to a external display. These noises start when the display turns off after being idle for sometime.
My Event log is filled with even IDs 9020 and 9009 alternating every minute. I couldn't find any information online.
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hi koushikt,
Welcome to the Forums.
The Desktop Window Manager is a part of Windows 8 that manages the aero effects (i.e. Aero Peek, Window Coloration, etc.). From the screenshots that you posted, it looks like a problem with DWM itself as discussed in this microsoft article.
Can you try to:
1. Run Windows Updates to get the latest patch and bug fixes for your OS.
2. Update your display driver (if you have Intel HD 4000 Graphics, get it here)
3. Disable visual effects and reboot.
Let me know your findings,
neoeknchi
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Laptop keeps making device connect and Device disconnect sound.

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