@mmifas, According to the alsa-info.txt of the #20, it looks like the audio driver did not detect the headphone/headset plugging event at all, if it detects the plug/unplug event, the pulseaudio will automatically switch the output from the speaker to headphone, don't need you to manually change the alsamixer stuffs.
I guess after you plug in the headphone/headset, the output still only comes from speaker, then you use some way (like using the pavucontrol mentioned in the #13) to let the headphone work, but the driver and pulseaudio still think the headphone is not plugged, as a result the sound will be played out both from the speaker and headphone. Please check /proc/interrupts on your machine, and notice the line end with the key word snd_hda_intel, this is the interrupt count for sound driver, plug and unplug the headset/headphone, let us see if this will trigger interrupt or not. thx. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1447909 Title: external mic not detected on machines with alc256 codec Status in HWE Next: Fix Released Status in linux package in Ubuntu: Fix Released Bug description: This bug is used for tracking, please do not triage. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1447909/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
