Re: [gentoo-user] Something started muting the sound

[Mick <michaelkintzios@gmail.com>]

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On Monday 14 Aug 2017 19:31:48 Robin Atwood wrote:
> On Monday 14 August 2017, Mick wrote:
> > On Sunday 13 Aug 2017 20:27:12 Robin Atwood wrote:
> > > On Saturday 12 August 2017, Alexander Kapshuk wrote:
> > > However, grepping dmesg was interesting:
> > > 
> > > # grep HDA /var/log/dmesg
> > > [   10.981754] input: HDA Digital PCBeep as
> > > /devices/pci0000:00/0000:00:1b.0/sound/card0/hdaudioC0D0/inp
> > > ut9
> > > [   10.981963] input: HDA Intel MID Mic as
> > > /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
> > > [   10.982033] input: HDA Intel MID Dock Mic as
> > > /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
> > > [   10.982102] input: HDA Intel MID Dock Headphone as
> > > /devices/pci0000:00/0000:00:1b.0/sound/card0/input
> > > 12
> > > [   10.982171] input: HDA Intel MID Headphone as
> > > /devices/pci0000:00/0000:00:1b.0/sound/card0/input13
> > 
> > The above shows you have your laptop docked.  When docked the on board
> > speakers are usually disconnected.
> > 
> > It's been a very long time since I docked a laptop and my memory is not
> > very reliable, but I recall fixing a similar problem by selecting a
> > different output device.  I don't know if you can do this from alsamixer,
> > but you should be able to do it from pulseaudio, or from whatever GUI your
> > desktop provides for managing audio devices.  Switch over from
> > headphones/docking station to speakers and you should be OK.
> 
> That's very interesting and would explain a lot except that I don't have a
> dock! So does anybody have an idea as to why the TP has decided it's been
> docked when it hasn't? There are not currently any other output devices to
> select (AFAICT).
> 
> Thanks
> Robin

It could be a hardware problem.  Check the docking port has not been unlocked 
accidentally for some reason, no debris is shorting its connectors and that 
the BIOS menu does not report it being docked.  I think the audio output 
device symptom is controlled by ACPI, but before blaming bugs in ACPI I'd 
start by looking at the hardware in the first instance.
-- 
Regards,
Mick

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