David, tried your trick with snd-hda-tools. Headphones turned on, they are 
working perfectly, but in alsamixer they're still disabled. Moreover, i could 
not block speakers to isolate sound from them, so sound goes to them and to 
headphones simultaneously.
Here is additional info: headphones turn off if i touch any of the following 
options in alsamixer (they all listed in playback):
* front mic 
* line
* CD (i don't have cd-rom)
* mic
* smart 5.1 - this option can only mute and unmute.
In this case, sound in headphones can be restored only with snd-hda-tools.
I'll attach my alsa info with working headphones just in case.
PS: in windows 7 headphones are working, but automatic detection in front jack 
is corrupted. There i turned off detection and switch default output device 
between speakers and headphones.

** Attachment added: "alsa-info2.txt"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/607482/+attachment/1675577/+files/alsa-info2.txt

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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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