I used to have a 550 DSP Plantronics headset on my FC4 machine and it works perfectly fine. Just recently i purchased 750 DSP plantronics headset and i cannot make the microphone work. I also tried another Plantronics model and it pause the same problem. I tried borrowing another 550 DSP the model that I used to have and it is working perfectly fine. I cannot purchased the same model anymore because they stop producing DSP 550 model. I already bought two new Plantronics headset but both of them pause the same problem in the micropone. I need this working really bad. Please help me out!!

Thanks...

How do they connect: wireless, bluetooth or cable?

It is connected through USB cable.

Have you checked alsamixer/kmix to see if the headphones are muted? Do other USB devices work on your system?

The only solution to make microphone work is to install linux-backports-modules-alsa-generic...

Just go to:

Menu / System / Administration / Synaptic Package Manager

And search and mark for installation:

linux-backports-modules-alsa-generic

tip: if you have multiple versions click on the first and read the description which should inform what name to install...

If after the reboot and mic mute is off, still does not work, just go to terminal and type:

sudo nano /etc/modprobe.d/alsa-base.conf

and add or change the following:

options snd-hda-intel model=auto enable=yes

Then Ctrl+X, type Y to write and exit, reboot and mic will work.

Bye and have lots of fun with Ubuntu (the best).

Also, test the equipment on another computer where you know that USB headsets are proven to work just to make sure it's not a hardware problem (which is admittedly unlikely, but well to rule out).

This thread is 4 years old. I would think that this issue is sorted out.