using default 2.1 would mean that 3rd and 4th channel would get only 0.5
of the whole lfe? or each of them would get 1.0 (exact same copy of the
whole signal) ?

if both of them would get 1.0 then i think it should be enough.
the question is how to force driver to give me that mapping? - is some commit  
like this needed?
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound?id=c6cc3d58b4042f5cadae653ff8d3df26af1a0169

so when asus n56vzz / asus n76vz (my case) instead of asus4mode it would
give me hmm lets name it 2.1mode or the number of channels and the
channel mapping are not the same thing? i mean i still need to use
asus4mode but with smth additional so  i would get this particular
channel mapping?

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https://bugs.launchpad.net/bugs/1040873

Title:
  [N56VZ, Realtek ALC663, Black Headphone Out, Right] No sound at all:
  Subwoofer not working

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