Thanks for your suggestions.
Yes, I've made sure the mic isn't muted in alsamixer.
I just tried Fedora 25, no joy there either.
The Dell Windows driver for this is IDT High-Definition Audio 92HD93 Driver
and is supported on the Latitude 3330/6430u/E5x30/E6x30 and Precision
M4700/M6700
ie Latitude E3300, E5430, E5530, E6230, E6330, E6430, E6530
ALSA support for IDT 92HD93 was added years ago by
http://www.spinics.net/lists/stable-commits/msg13678.html
sound/pci/hda/patch_sigmatel.c just uses patch_stac92hd83xxx
enum {
STAC_92HD83XXX_AUTO,
STAC_92HD83XXX_REF,
STAC_92HD83XXX_PWR_REF,
STAC_DELL_S14,
STAC_92HD83XXX_HP,
STAC_92HD83XXX_HP_cNB11_INTQUAD,
STAC_HP_DV7_4000,
STAC_92HD83XXX_MODELS
};
In HD-Audio-Models.txt we have
STAC92HD83*
===========
ref Reference board
mic-ref Reference board with power management for ports
dell-s14 Dell laptop
dell-vostro-3500 Dell Vostro 3500 laptop
hp-dv7-4000 HP dv-7 4000
hp_cNB11_intquad HP CNB models with 4 speakers
hp-zephyr HP Zephyr
hp-led HP with broken BIOS for mute LED
hp-inv-led HP with broken BIOS for inverted mute LED
auto BIOS setup (default)
so I tried model=dell-s14 but that didn't help.
I'm starting to suspect that the support has atrophied in the last couple
of years?
thanks .. Jason
On Sun, May 7, 2017 at 6:33 PM, Paul Menzel <
paulepan...@users.sourceforge.net> wrote:
> Dear Jason,
>
>
> Am Mittwoch, den 03.05.2017, 15:20 +1000 schrieb Jason Harrop:
> > I've got a Dell M4700 running Ubuntu linux 16.04, and the latest ALSA
> > driver, but I can't get the internal microphone to work. I did have a
> USB
> > mic working, but not any more it seems...
>
> […]
>
> First the obvious, did you make sure, the microphone is not muted?
>
> Have you tried a newer software stack? As you already use Ubuntu, you
> could give Ubuntu 17.04 a try. Any other GNU/Linux distribution as
> Fedora or Debian also work, and provide live images. You can prepare a
> USB storage medium, and boot your system from it, without having to
> install it.
>
> If the problem persists, please contact the list alsa-devel, and also
> report an issue to the Ubuntu bug tracker [1].
>
>
> Thanks,
>
> Paul
>
>
> [1] https://wiki.ubuntu.com/DebuggingSoundProblems
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