I have an HP laptop, and my sound card is (displayed using PCIutils for Windows):
and I am finding difficulties in getting stereo sound from analogical headphones (plugged in with 3.5mm jack). Drivers downloaded from HP or Realtex do not work, drivers supplied by Windows (although they are Realtek drivers as well) sometimes work, I mean: speakers and headphones are shown together at the mixer, and sound from headphones is not stereo. I then go to device manager, audio input and output, and uninstall "Speakers/Headphones". I then reboot with my headphones plugged in, and, after that, the sound is stereo, and (IIRC) the mixer distinguishes between headphones and speakers.
Intel Corporation 7 Series / C210 Series
But then things get broken back soon: one time, the windows updated the sound driver, and no stereo sound again. I uninstalled the device, rebooted, and stereo back. Then I unplugged the headphones, and windows said that no speakers were found: I restarted the audio device, speakers were found again, but stereo broken again
I think that debugging this looks tricky but, do you have any ideas?
Thank you in advance.