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

[Mick <michaelkintzios@gmail.com>]

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On Sunday 13 Aug 2017 20:27:12 Robin Atwood wrote:
> On Saturday 12 August 2017, Alexander Kapshuk wrote:
> > On Sat, Aug 12, 2017 at 4:49 PM, Robin Atwood <robin@binro.org> wrote:
> > What's the output of these command lines?
> > (1). lspci -vnn | sed '/Audio/,/driver/!d'
> > 
> > (2). grep -Ei '^[^#]*(snd|hda)' linux/.config
> > 
> > (3). rc-update show | grep alsa
> > 
> > (4). grep HDA /var/log/dmesg
> 
> The output was what you would expect, lots info about HDA drivers and
> hardware:
> 
> lspci -vnn | sed '/Audio/,/driver/!d'
> 00:1b.0 Audio device [0403]: Intel Corporation 5 Series/3400 Series Chipset
> High Definition Audio [8086:
> 3b56] (rev 06)
>        Subsystem: Lenovo 5 Series/3400 Series Chipset High Definition Audio
> [17aa:215e]
>        Flags: bus master, fast devsel, latency 0, IRQ 28
>        Memory at f2420000 (64-bit, non-prefetchable) [size=16K]
>        Capabilities: [50] Power Management version 2
>        Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
>        Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
>        Kernel driver in use: snd_hda_intel
> 01:00.1 Audio device [0403]: NVIDIA Corporation High Definition Audio
> Controller [10de:0be3] (rev a1)
>        Subsystem: Lenovo High Definition Audio Controller [17aa:218f]
>        Flags: bus master, fast devsel, latency 0, IRQ 29
>        Memory at cdefc000 (32-bit, non-prefetchable) [size=16K]
>        Capabilities: [60] Power Management version 3
>        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
>        Capabilities: [78] Express Endpoint, MSI 00
>        Kernel driver in use: snd_hda_intel
> 
> 
> 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.


> No output about the speakers. On another system (that works) I see:
> 
> [   20.712891] input: HDA Intel Rear Mic as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input5
> [   20.712984] input: HDA Intel Front Mic as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input6
> [   20.713097] input: HDA Intel Line as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input7
> [   20.713185] input: HDA Intel Line Out as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
> 
> I think Line Out is a speaker. So why the difference?
> 
> Thanks
> Robin

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.

-- 
Regards,
Mick

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