Asus N55JM headphones don't work

[Dmitriy]

I USE ASUS N55JM with ALC668 onboard
I expect to hear sound from headphones if it's plugged in, at least in parallel with speakers. But I can't set it up.

Also I expect my subwoofer working when choosing ALSA and 2.1 mode in VLC audio settings, but in fact it doesn't sound at all

I tried the trick described in similar bug I found(https://bugs.launchpad.net/ubuntu/+source/alsa-tools/+bug/1405691, https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/871808) with hdajackretask with pin 0x1a as LFE and hda_analyzer - no effect though

Debug info
http://www.alsa-project.org/db/?f=b5e564ec981f30eee9346a791fb0f51874e23b59

Actually I even can see right pin detection
sudo hdajacksensetest -c 1 -a
Pin 0x12 (Internal Mic): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x15 (Black Headphone, Right side): present = Yes
Pin 0x16 (Not connected): present = No
Pin 0x18 (Not connected): present = No
Pin 0x19 (Pink Mic, Left side): present = No
Pin 0x1a (Internal Speaker): present = Yes
Pin 0x1b (Black Mic, Left side): present = No
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No
Pin 0x1f (Not connected): present = No

I see 0x15 - Headphone pin, 0x1a - subwoofer.
But I can't make sound headphones nor subwoofer