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In my old Dell laptop, running Windows 7, whenever I would plug an earphone in, the volume automatically drops down to what I have set in the past when the earphones were plugged in. The volume again goes back to the last set level when the earphones weren't plugged in after I unplug the earphones.

This isn't happening with my new Acer laptop, running Windows 8. Is it a Windows 8 bug or does it have to do anything with the drivers?

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It's a driver's feature. Some drivers can detect audio jack plugged in or provide separate output devices for jack and built-in speakers. –  gronostaj May 4 '13 at 20:02
Have you got any suggestions on how to get such driver for my laptop, Acer Aspire V3-571G? –  Abhishek Singh May 5 '13 at 8:38
My driver does detect when an earphone is plugged in. It is just not adjusting the volume level automatically. –  Abhishek Singh May 5 '13 at 8:49
If the latest driver for your sound card doesn't have this feature, then you have to look for another solution. Maybe there's some program that provides this feature, but I haven't heard of one. –  gronostaj May 5 '13 at 12:09

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