> > HW: ThinkPad T-510, x86_64 > SW: Arch Linux (synched within a week) kernel = 3.19.2, PA 6.0 > > On the above setup, the mic mute function (invoked via pavucontrol) works as > expected: Click the mute icon, it mutes the mic input, indicates the muted > state by greying out the pavucontrol mic gain control, and illuminates the > little LED on the mic mute button. > > But the analogous functionality for muting audio output only does the > first two things, and has no effect on the mute LED. (The LED is always off.) > > From googling around, I'm pretty sure that these two particular LEDs are not > directly under user control (e.g. via ACPI) but are somehow bound to the > mute/unmute functionality in the snd-hda-intel driver. This understanding is > based on kernel posts like this: > > <a href="https://bugzilla.kernel.org/show_bug.cgi?id=49391">https://bugzilla.kernel.org/show_bug.cgi?id=49391</a> The above report seem has no relationship with your problem, the laoptop has dual headphone jacks, four speakers and subwoofers > > and other similar ones. > > Before filing a ticket with the kernel guys, wanted to ask if this > function-LED binding is in any way under control of pulseaudio itself? > In other words, I guess what I'm asking is whether pulseaudio just tells > the driver to "mute the audio", and the driver sets the LED state accordingly, > or whether pulse tells the driver separately to "mute the audio" and also > "turn on the LED". > > Knowing the answer to this, I can post a more informative ticket to the > kernel guys. (Or maybe the fix is even in pulseaudio itself?) <a href="https://bugs.launchpad.net/ubuntu/+source/udev/+bug/408903">https://bugs.launchpad.net/ubuntu/+source/udev/+bug/408903</a> If your mic mute generate keypress event and key release event, you need pulseaudio also listen to those event to update the status of mic mute icon in pavucontrol <a href="https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=b317b032d2dcb5e518cc9630cc6f1c7c24afedfc">https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=b317b032d2dcb5e518cc9630cc6f1c7c24afedfc</a>