The Issue:

Speakers working, plug in the headphones, they are recognized, the notebook switches automatically to them but no sound.

If the headphones have an incorporated microphone, the microphone does not work.
inxi -Fxxxz

System:    Kernel: 5.8.1-3-MANJARO x86_64 bits: 64 compiler: N/A Desktop: Xfce 4.14.2 tk: Gtk 3.24.20 info: xfce4-panel 
           wm: xfwm4 dm: LightDM 1.30.0 Distro: Manjaro Linux 
Machine:   Type: Laptop System: ASUSTeK product: Strix 17 GL703GE v: 1.0 serial: <filter> 
           Mobo: ASUSTeK model: GL703GE v: 1.0 serial: <filter> UEFI: American Megatrends v: GL703GE.318 date: 07/19/2019 
Battery:   ID-1: BAT1 charge: 57.5 Wh condition: 57.5/64.4 Wh (89%) volts: 5.0/15.2 model: ASUS A32-K55 type: Li-ion 
           serial: N/A status: Full 
CPU:       Topology: 6-Core model: Intel Core i7-8750H bits: 64 type: MT MCP arch: Kaby Lake rev: A L2 cache: 9216 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 52815 
           Speed: 2167 MHz min/max: 800/4100 MHz Core speeds (MHz): 1: 2187 2: 2187 3: 2188 4: 2188 5: 2187 6: 2187 7: 2187 
           8: 2187 9: 2187 10: 2188 11: 2188 12: 2188 
Graphics:  Device-1: Intel UHD Graphics 630 vendor: ASUSTeK driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:3e9b 
           Device-2: NVIDIA GP107M [GeForce GTX 1050 Ti Mobile] vendor: ASUSTeK driver: nvidia v: 440.100 bus ID: 01:00.0 
           chip ID: 10de:1c8c 
           Device-3: Holitech USB2.0 HD UVC WebCam type: USB driver: uvcvideo bus ID: 1-7:3 chip ID: 2fee:1014 
           serial: <filter> 
           Display: x11 server: X.Org 1.20.8 driver: modesetting,nvidia resolution: 1920x1080~120Hz s-dpi: 96 
           OpenGL: renderer: GeForce GTX 1050 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 440.100 direct render: Yes 
Audio:     Device-1: Intel Cannon Lake PCH cAVS vendor: ASUSTeK driver: snd_hda_intel v: kernel bus ID: 00:1f.3 
           chip ID: 8086:a348 
           Sound Server: ALSA v: k5.8.1-3-MANJARO 
Network:   Device-1: Intel Wireless-AC 9560 [Jefferson Peak] driver: iwlwifi v: kernel port: 5000 bus ID: 00:14.3 
           chip ID: 8086:a370 
           IF: wlo1 state: down mac: <filter> 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK driver: r8169 v: kernel port: 3000 
           bus ID: 03:00.0 chip ID: 10ec:8168 
           IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
           IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A 

pulseaudio --dump-conf

### Read from configuration file: /etc/pulse/daemon.conf ###
daemonize = no
fail = yes
high-priority = yes
nice-level = -11
realtime-scheduling = yes
realtime-priority = 5
allow-module-loading = yes
allow-exit = yes
use-pid-file = yes
system-instance = no
local-server-type = user
cpu-limit = no
enable-shm = yes
flat-volumes = no
lock-memory = no
exit-idle-time = 20
scache-idle-time = 20
dl-search-path = /usr/lib/pulse-13.0/modules
default-script-file = /etc/pulse/default.pa
load-default-script-file = yes
log-target = 
log-level = notice
resample-method = auto
avoid-resampling = no
enable-remixing = yes
remixing-use-all-sink-channels = yes
enable-lfe-remixing = no
lfe-crossover-freq = 0
default-sample-format = s16le
default-sample-rate = 44100
alternate-sample-rate = 48000
default-sample-channels = 2
default-channel-map = front-left,front-right
default-fragments = 4
default-fragment-size-msec = 25
enable-deferred-volume = yes
deferred-volume-safety-margin-usec = 8000
deferred-volume-extra-delay-usec = 0
shm-size-bytes = 0
log-meta = no
log-time = no
log-backtrace = 0
rlimit-fsize = -1
rlimit-data = -1
rlimit-stack = -1
rlimit-core = -1
rlimit-rss = -1
rlimit-as = -1
rlimit-nproc = -1
rlimit-nofile = 256
rlimit-memlock = -1
rlimit-locks = -1
rlimit-sigpending = -1
rlimit-msgqueue = -1
rlimit-nice = 31
rlimit-rtprio = 9
rlimit-rttime = 200000

sudo dmesg | grep snd

[    2.491432] snd_hda_intel 0000:00:1f.3: enabling device (0000 -> 0002)
[    4.317198] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[    4.442975] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC295: line_outs=1 (0x17/0x0/0x0/0x0/0x0) type:speaker
[    4.442979] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    4.442981] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[    4.442982] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
[    4.442983] snd_hda_codec_realtek hdaudioC0D0:    inputs:
[    4.442984] snd_hda_codec_realtek hdaudioC0D0:      Headset Mic=0x19
[    4.442986] snd_hda_codec_realtek hdaudioC0D0:      Internal Mic=0x12

alsa-info.sh --upload

http://alsa-project.org/db/?f=b46e9e85f6f8eb5609a77f3ef45003fa4910490f

What i tried:

    alsamixer (Headphones seen as plugged in but no sound)

    pulseaudio -k and then reboot

    different headphones both with mic incorporated and without

Side note: bluetooth headset Aukey perfectly seen and working.