Simple mixer control 'Headphone',0
  Capabilities: pswitch penum
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]

no headphone playback volume, seem share volume control with front line
out

try latest alsa driver


https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS

headphone can connected to node 0x26 to use amp out at node 0x26

Node 0x1b [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0000373e: IN OUT HP Detect Trigger
    Vref caps: HIZ 50 GRD 80 100
  Pin Default 0x02214c20: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0
  Pin-ctls: 0xc0: OUT HP VREF_HIZ
  Unsolicited: tag=00, enabled=0
  Connection: 5
     0x0c* 0x0d 0x0e 0x0f 0x26

Node 0x25 [Audio Output] wcaps 0x11: Stereo
  Converter: stream=0, channel=0
  PCM:
    rates [0x560]: 44100 48000 96000 192000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
Node 0x26 [Audio Mixer] wcaps 0x20010f: Stereo Amp-In Amp-Out
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x80 0x80]
  Amp-Out caps: ofs=0x1f, nsteps=0x1f, stepsize=0x05, mute=0
  Amp-Out vals:  [0x00 0x00]
  Connection: 2
     0x25 0x0b


dB range of front is -46.5dB to 0dB

you need to ask why dB range of pulseaudio is -144dB to 0dB

control.1 {
                iface MIXER
                name 'Front Playback Volume'
                value.0 31
                value.1 31
                comment {
                        access 'read write'
                        type INTEGER
                        count 2
                        range '0 - 31'
                        dbmin -4650
                        dbmax 0
                        dbvalue.0 0
                        dbvalue.1 0
                }



0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Path analog-output (Analog 
Output), direction=1, priority=99, probed=yes, supported=yes, has_mute=yes, 
has_volume=yes, has_dB=yes, min_volume=0, max_volume=31, min_dB=-144, max_dB=0
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element Master, direction=1, 
switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=yes
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element Headphone, 
direction=1, switch=1, volume=0, volume_limit=-1, enumeration=0, required=0, 
required_any=0, required_absent=0, mask=0x0, n_channels=0, override_map=no
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element Front, direction=1, 
switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x6, n_channels=2, override_map=yes
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element Surround, 
direction=1, switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, 
required_any=0, required_absent=0, mask=0x60, n_channels=2, override_map=yes
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element Side, direction=1, 
switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0xc00, n_channels=2, override_map=yes
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element Center, direction=1, 
switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x4900000000018, n_channels=1, override_map=yes
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element LFE, direction=1, 
switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x80, n_channels=1, override_map=yes
(   0.267|   0.000) D: [pulseaudio] alsa-mixer.c: Element PCM, direction=1, 
switch=0, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
(   0.267|   0.000) I: [pulseaudio] alsa-sink.c: Successfully enabled 
synchronous volume.
(   0.267|   0.000) I: [pulseaudio] alsa-sink.c: Hardware volume ranges from 
-144,00 dB to 0,00 dB.

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https://bugs.launchpad.net/bugs/1251377

Title:
  Since last week  update I can't change volume with keyboard

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