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i have installed xubuntu and it's all okey, but the sounds/audio don't work in the headphones also if are recognized by the system. Help pls

Here there are some useful informations:

Result of lspci | grep -i audio

00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High     
Definition Audio Controller (rev 04)01:00.1 
Audio device: NVIDIA Corporation GK104 HDMI Audio Controller (rev a1)

Result of aplay -l

**** Lista di PLAYBACK dispositivi hardware ****
scheda 0: PCH [HDA Intel PCH], dispositivo 0: ALC892 Analog [ALC892 Analog]
Sottoperiferiche: 1/1
Sottoperiferica #0: subdevice #0
scheda 0: PCH [HDA Intel PCH], dispositivo 1: ALC892 Digital [ALC892 Digital]
Sottoperiferiche: 1/1
Sottoperiferica #0: subdevice #0
scheda 1: NVidia [HDA NVidia], dispositivo 3: HDMI 0 [HDMI 0]
Sottoperiferiche: 1/1
Sottoperiferica #0: subdevice #0
scheda 1: NVidia [HDA NVidia], dispositivo 7: HDMI 1 [HDMI 1]
Sottoperiferiche: 1/1
Sottoperiferica #0: subdevice #0
scheda 1: NVidia [HDA NVidia], dispositivo 8: HDMI 2 [HDMI 2]
Sottoperiferiche: 1/1
Sottoperiferica #0: subdevice #0
scheda 1: NVidia [HDA NVidia], dispositivo 9: HDMI 3 [HDMI 3]
Sottoperiferiche: 1/1
Sottoperiferica #0: subdevice #0

Result of cat /proc/asound/card0/codec* | grep Codec

Codec: Realtek ALC892

I have all configured, alsamixer, alsa, pulseaudio and the audio is recognized by the system but in the headphones don't work

ii  alsa-base                            1.0.25+dfsg-0ubuntu4                all              ALSA driver configuration files
ii  alsa-utils                           1.0.25-4ubuntu2                     i386         Utilities for configuring and using ALSA
ii  bluez-alsa:i386                      4.101-0ubuntu8b1                    i386         Bluetooth ALSA support
ii  gstreamer0.10-alsa:i386              0.10.36-1.1ubuntu1                  i386         GStreamer plugin for ALSA
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