Yuriy, looks like the jack detection of the pin is somehow broken, as in the 
"broken" version, the headphone pin is in powersave mode. It would be good to 
verify that this is not just your hardware that is broken, but the entire 
model. 
With your headphones plugged in, can you please try download and install 
snd-hda-tools from my PPA, then issue the following command:
hda-verb /dev/snd/hwC0D0 0x1d SET_POWER_STATE 0
...and see if it helps? It should take effect immediately. After that, please 
post an alsa-info. Thanks!

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[VIA VT1708S] ALSA test tone NOT correctly played back for headphone but works 
fine for speakers
https://bugs.launchpad.net/bugs/607482
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