Well. I've found (semi)solution for myself, so i will describe my end situation:
I've set independent hp on
restarted.
Headphones become enabled. Their level has influence on headphones, but if i 
make it mute - sound mutes everywhere (hp and speakers).
Master channel has influence only on speakers. If i mute it, however, it mutes 
everything. It unmutes normally, so i don't have to do  
SET_POWER_STATE 0.
Headphones level influence only on headphones. It mutes everything, unmutes 
normally.
PCM - can't be muted. Has influence on everything.
Front - has effect on speakers only. If it mutes, mutes everything. Unmutes 
normally.
Front Mic - any change mutes hp. must do SET_POWER_STATE.
Surround - level doesn't matter. Mutes everything. Unmutes normally.
Center - level doesn't matter. Mutes everything. Unmutes normally.
LFE -  level doesn't matter. Mutes everything. Unmutes normally.
Side - level matters only for hp. mutes everything. Unmutes normally.
Line, CD, Mic -  any change mutes hp. must do SET_POWER_STATE.

Solution is just playing with Master and Headphones levels with amixer.
However, it could be almost normal without obligatory SET_POWER_STATE in
the beginning of session

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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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