On 06/11/17 18:40, Daniel Krebs wrote: > I'm struggling to configure the audio output of my Fedora 25 > installation. I'd like to find a way to easily switch between front > audio (headphones) and line out in Gnome Shell without physically > plugging/unplugging any jacks. > > So to clarify my setup is as followed (on ASUS PRIME B350-PLUS > Mainboard with Realtek ALC887 Audio Codec): > > * Headphones connected to the front headphone jack of my case via > internal mainboard header > > * Amplifier connected to green jack on the mainboards backpanel > > When both, amp and headphones, are connected, the sound is only played > via headphones. In the Gnome audio settings the the line out output > device disappears and there is only the headphones output device. > > Then I used alsamixer so change "Auto-Mute Mode" from [Enabled] to > [Disabled]. This way sound is played via amp and headphones > simultaneously. Gnome audio settings still shows only the headphones > as output device. I can than change Volume of "Headphones" and "Front" > via alsamixer separately to get any mute/unmute combination I want but > obviously this is neither comfortable nor compatible with any gnome > extensions that would let me change output easily (like > https://extensions.gnome.org/extension/906/sound-output-device-chooser/) > > I generated more Information with the alsa-info.sh script which can be > found here: > http://www.alsa-project.org/db/?f=9c9fd41a57760353f5989f85ae5b8e9185d1c2f6 > > > Any Ideas? Personally, I like to use pavucontrol (Pulse Audio Volume Control). I have 2 Audio Output Devices. One is the built-in audio device on my mother board, the other HDMI audio out on my nVidia card. With pavucontrol I can select which device I want a particular application to use and I can mute and adjust volume individually. My headphones are out of order at the moment due to the cord being chewed by a cat and I don't need it....but if I plugged it in I would have a 3rd output device and could assign it on a per application basis.

00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05) 01:00.1 Audio device: NVIDIA Corporation GK106 HDMI Audio Controller (rev a1) I have my Bose speakers plugged into the line-out on the back-panel of my tower. In pavucontrol it shows as plugged in. When I plugin a set of headphones into the headphone jack at the front of the tower the speakers cut out and the headphones are active and show active in pavucontrol. http://tinyurl.com/yave5h2g has some screenshots which I think are self explanatory. I think it is the job of the HW to cut out the Line output when the headphones are inserted and inform the SW. FWIW, I'm also using KDE but it shouldn't make a difference.

A crude/basic workaround would be to use something like this command: $ amixer -q set Headphone toggle && amixer -q set Front toggle This assumes you have one of them muted and the other unmuted and it'll simply toggle their states. You can assign this command to a _custom_ shortcut in the gnome-control-center -> Keyboard and assign some hotkey or key combo to invoke it.

FWIW, just to clarify. I'm not pulling out the connector at the back of the tower that is connected to the speakers. It seems the HW is doing that in some manner. I've not had a 3.5mm jack go bad on me. Then again I don't use headphones all that much with my PC and when I do I just use Bluetooth.

If I get the chance later today I'll check to see if the KDE systray app offers a different settings option.