[Alsa-user] Problem with front headphone connector

[Paul Menzel]

Dear ALSA users,


Linux 4.9.30 is used.

Using a Fujitsu Desktop ESPRIMO P756 E85 with a Realtek ALC671,
depending on the file with stereo sound, I need to pull the headphone
jack a little out to hear both channels. But for others, I need to push
it back in.

```
[ 2.227043] ALSA device list:
[ 2.227205] No soundcards found.
[ 2.235428] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC671:
line_outs=1 (0x21/0x0/0x0/0x0/0x0) type:line
[ 2.235574] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=1
(0x17/0x0/0x0/0x0/0x0)
[ 2.235725] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1
(0x14/0x0/0x0/0x0/0x0)
[ 2.235862] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ 2.235959] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 2.236053] snd_hda_codec_realtek hdaudioC0D0: Front Mic=0x19
[ 2.236150] snd_hda_codec_realtek hdaudioC0D0: Rear Mic=0x18
[ 2.236246] snd_hda_codec_realtek hdaudioC0D0: Line=0x1a
[ 2.245778] random: fast init done
[ 2.247897] snd_hda_codec_hdmi hdaudioC0D2: No i915 binding for Intel
HDMI/DP codec
[ 2.249253] input: HDA Intel PCH Front Mic as
/devices/pci0000:00/0000:00:1f.3/sound/card0/input4
[ 2.249690] input: HDA Intel PCH Rear Mic as
/devices/pci0000:00/0000:00:1f.3/sound/card0/input5
[ 2.249868] input: HDA Intel PCH Line as
/devices/pci0000:00/0000:00:1f.3/sound/card0/input6
[ 2.250045] input: HDA Intel PCH Line Out as
/devices/pci0000:00/0000:00:1f.3/sound/card0/input7
[ 2.250216] input: HDA Intel PCH Front Headphone as
/devices/pci0000:00/0000:00:1f.3/sound/card0/input8
[ 2.250609] input: HDA Intel PCH HDMI/DP,pcm=3 as
/devices/pci0000:00/0000:00:1f.3/sound/card0/input```

Do you know if that is a hardware defect, or can some workaround be
added to the Linux kernel?


Kind regards,

Paul

[chris hermansen]

Paul and list,

Post by Paul Menzel
Dear ALSA users,
Using a Fujitsu Desktop ESPRIMO P756 E85 with a Realtek ALC671, depending
on the file with stereo sound, I need to pull the headphone jack a little
out to hear both channels. But for others, I need to push it back in.
[stuff deleted]
Do you know if that is a hardware defect, or can some workaround be added
to the Linux kernel?

Paul, this sounds like hardware to me. I would try another set of
headphones or a different connecting cable. I would try the same
headphones into the speaker output of the desktop and see what the
behaviour is. I would try the speakers into the headphone output. And
finally I would try a live USB stick or CD with a different distro /
different kernel.

[John Mills]

Date: Wed, 7 Jun 2017 14:16:56 +0200
Subject: [Alsa-user] Problem with front headphone connector
Dear ALSA users,
Linux 4.9.30 is used.
Using a Fujitsu Desktop ESPRIMO P756 E85 with a Realtek ALC671,
depending on the file with stereo sound, I need to pull the
headphone jack a little out to hear both channels. But for others, I
need to push it back in.
Do you know if that is a hardware defect, or can some workaround be
added to the Linux kernel?

Paul,
Do the headphones have a TRRS (4-conductor) plug?
Many do these days, as they are designed for mobile phones.
You may need a converter from TRRS (tip-ring-ring-sleeve) to TRS
(tip-ring-sleeve).
Some manufacturers are not forthcoming with information about the wiring
of their plugs, but it's usually reasonably easy to discover by measurement.
There are, of course, several "standards".
A search on the CTIA vs OMTP standards may prove informative.

Worth checking before software.
If the software differences are absolutely repeatable, then I defer to your results.

Hope this helps
John Mills