in music and video playing my laptop speaker works well but when I plugin headphone the sound is terrible. and in setting>sound>test speakers, my headphone sound is well but in music and video players is not good.
my device is:
lspci -v | grep Audio
Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0

what is my problem and how can I fix it.

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