/usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones-2.conf is in pulseaudio 1:4.0-0ubuntu11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
; Path for mixers that have a 'Headphone2' control
;
; See analog-output.conf.common for an explanation on the directives
[General]
priority = 89
name = analog-output-headphones
[Properties]
device.icon_name = audio-headphones
[Element Hardware Master]
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right
[Element Master]
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right
[Element Master Mono]
switch = off
volume = off
; This profile path is intended to control the second headphones, not
; the first headphones. But it should not hurt if we leave the
; headphone jack enabled nonetheless.
[Element Headphone]
switch = mute
volume = zero
[Element Headphone2]
required = any
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right
[Element Speaker]
switch = off
volume = off
[Element Desktop Speaker]
switch = off
volume = off
; On some machines Front is actually a part of the Headphone path
[Element Front]
switch = mute
volume = zero
[Element Rear]
switch = off
volume = off
[Element Surround]
switch = off
volume = off
[Element Side]
switch = off
volume = off
[Element Center]
switch = off
volume = off
[Element LFE]
switch = off
volume = off
.include analog-output.conf.common
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