Looks like the combo jack is a throwback to the situation of 6 or 7 years ago when the only input jack on most of the Dell laptops was a mono mic jack. You would need an external audio interface. If the Dell combo jack is similar then you cannot record line-in even with an adapter. One person wrote: 'In my T410 the 4-pin Audio pinning is (counted from Tip): left ear - right ear - Gnd - Mic ' The bad news is that on the Lenovo models they discussed, the mic portion of the combo jack is only mono. They discuss using adapters for their combo port and provide some links: I am still curious this morning so I did some googling and found an interesting thread on the Lenovo forum. Thanks, I hope you have a great year too. I'm disappointed, but not too fussed, if it turns out to be impossible but I'm concerned that this is straight up false advertising if Dell lists it as an input jack when it has no capacity to do so. There is a 'jack information' tab but all it displays is my jack, a headphone icon above it, and it lights up when I plug something in, but no other options. I've checked the audio program that came bundled with this computer but I have absolutely no option to change it. Hence, the mic input, for example, could be switched into a rear speaker output and such. It had 3 jacks, one mic, and two headphone jacks, but to support 5.1, these jacks could be switched around in an audio control panel program that was bundled with the computer. The closest example to how I thought it would work is an old XPS13 I used a long time ago. My computer doesn't have any second sound recording device shown underneath the onboard mic (Which all other laptops I owned did) suggesting that audio in was never supported. It is advertised as combo headphone/microphone, although I am not sure whether that is a new type of jack I haven't heard of, or that it can be switched between audio in and audio out (My guess).ДЄssuming it can be switched, I haven't found any way to switch it to audio in.

I looked through my previous post and I suppose it was a little vague.

Sound settings for linein mac