[pulseaudio-discuss] ThinkPad T-510 audio output mute LED non-workingness

[Raymond Yau]

>
> 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:
>
>     https://bugzilla.kernel.org/show_bug.cgi?id=49391

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?)

https://bugs.launchpad.net/ubuntu/+source/udev/+bug/408903

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

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=b317b032d2dcb5e518cc9630cc6f1c7c24afedfc
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