I've concluded that the problem is a hardware issue with this particular
M4700 laptop, since on another one, the mic works under Ubuntu 16.04 and
SUSE. When I boot this laptop with the other's hard drive (ie the distro
in which the mic is working), the mic doesn't work. Both machines are
running the same BIOS version, so I'm putting it down to a hardware issue
and moving on.
On Wed, May 10, 2017 at 6:17 AM, Jason Harrop <ja...@plutext.org> wrote:
> 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 <paulepanter@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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