Asus S200E laptop, HDA Intel PCH, ID 269 Analog: sound ok on speakers, hissing on headphones

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Hello.

This is with Gentoo, kernel 3.10.7, alsa-lib 1.0.27.2.

The sound card is:

# /usr/sbin/lspci
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset
Family High Definition Audio Controller (rev 04)

and aplay -L gives

# aplay -L
sysdefault:CARD=PCH
    HDA Intel PCH, ID 269 Analog
    Default Audio Device

When I play an audio file, the sound comes out on the internal speaker.

The 3.5mm jack connector is a 4-pole one, it embeds both speakers and
microphone.

If I connect a standard, 3-pole headphone on it, the sound comes out
hissing as if some medium frequencies were left out. The sibilants
(esses) are especially hard to bear, and the audio sounds 'hollow'.

Is a know problem of the driver, or is my hardware at fault? I can't
test on windows since I had to erase it from the HD to be reimbursed
from the cost of the licence by Asus.

Thanks for any info.

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