Comment 4 for bug 1132769

There is some confusion here that needs to be sorted out first.

1) Some machines (only from Asus AFAIK) have a single 3-pin jack, that can accept either a headphone or a mic, but not a 4-pin headset. When plugged in, you need to manually select headphone or mic in order to be able to use it. This is what the codec proc file tells me that this is, and this also is what the bug Anthony points at concerns. I wouldn't give my word that it was fixed in quantal, because nobody came back to me and confirmed that it actually worked in the distro, and also, this fix has not been completely backported to precise (and I don't want to SRU that before someone tells me that what I've done in quantal actually works).

2) Many more machines have a single 4-pin jack where you can plug either a 3-pin headphone or a 4-pin headset, but not a 3-pin mic. This is what Jeff says that this machine is.

3) If you go to Asus' specifications of the X401U, ( https://www.asus.com/Notebooks_Ultrabooks/X401U/#specifications ), it says that there is one 3-pin headphone jack, one 3-pin microphone jack and one line-in jack. Just to add to the confusion.

In order to proceed I need from someone with the hardware to reconfirm what type of jack this really is.