Audio Line Input for 6930P

The 6930P is one of several laptops I own. On each of the others, if I plug a line level audio source into the input jack and select "LINE" in control panel, I get audio. On the 6930P, while I can get audio on the input jack with control panel set to mic, I cannot get any audio with control panel set to line.
Just to be clear in my question, the audio source is a line level source, not a mic level source. When a line level source is plugged into a mic level input, the audio is overdriven and distorted. When I plug a line level source into the input jack on the 6930P, the audio is overdriven and distorted, as expected. It is normal and correct for a line level audio source to overdrive a mic leve input. On my other laptops, the problem is solved by switching to the line level input for the sound card. Switching to line level on this computer does not allow ANY audio to show up.
So the question is, does the 6930P have a line level input funtion?
(I'm aware that I can get that functionality with an external or PCMCIA sound card, but the question is about the hardware input jack on the internal sound card on the 6930P.)

I know it's a long time ago now ,and you may not even have this laptop any more, but did you ever end up finding a solution to this issue? I have the exact same issue and can't seem to find a solution anywhere!

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Audio Line Input for 6930P

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