I'm havingalmost the same problem except for the headphones work well mine don't it still fades (I'm having problems with keyboard too as u can see my space bar desnt work to well but that's not what I'm here for)
Can you elaborate what works and what not works with audio. I would suggest you to download realtek driver from company website and install with windows 8.1 comparability settings(right click exe file and troubleshoot compatibility,then select windows 8.1). And as for space bar goes may be you need to contact dell service for your problem(may be hardware issue). The main issue of fading in and out is with whole system not just dell built in speakers don't know may be Maxx sense is disabled when your headphones is plugged in.
Thanks! this suggestion worked perfectly on my dell 13 7348, guess these come off the line like cars. watch out for ones made on friday
I know this is an old thread. I just got my new Inspiron Inspiron 13 5000 and immediately had the same issue. I updated the firmaware thinking it was a Bluetooth issue (from a different post). Though I had fixed it. But it volume still decreased within a few seconds of playing any audio media. Then I found the solution by en.community.dell.com/.../portela and it worked! That worked until my batter got low this morning... Then the issue returned.
I found what fixed that latest symptom for me (at least for now) is a setting in MaxAudioPro --> Playback --> Advanced screen. I unchecked "Switch to battery save mode wheb battery is low" and the audio volume returned to normal levels.
I love my DELL laptop and am VERY happy I didn't have to call Dell Support.
I don't know if you guy keep having this problem, but I bought my dell 13 5000 a few weeks ago and had this same problem... It seems the latest driver from dell's website solves this problem. I had already checked the "do nothing" option as suggested in the beginning of the thread also, as an extra info.
On my Inspiron 7348 I had similar problems. On Windows 10 I installed the drivers from Windows 8.1 in compatibility mode. Now it seems all right.