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I am running Ubuntu 12.04 on a Lenovo Thinkpad T530. When I insert my headphones, the volume jumps to 100%, even if it was set lower before I inserted them (and also was lower the last time I used the headphones). If I then lower the volume and remove the headphones, the volume jumps to 100% again.

The only exception is that if the volume is muted, it stays muted when I insert or remove the headphones.

Any suggestions for what might be causing this?

lspci shows this audio device: 00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)

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Try booting up a 12.04 livecd. Does this happen when using the livecd as well? – balloons Aug 13 '12 at 14:49

Try controlling the volume using alsamixer.

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