To get the external subwoofer working, simply run this python script: http://pastebin.com/TstxjNKz
It's written by HDA Analyzer after that I found the right PIN to modify.
Moreover, to get the external microphone working like a charm, simply add the line
options snd-hda-intel model=asus-mode8
to the file /etc/modprobe.d/alsa-base.conf
right now it is not possible to compile drivers for GT635M.
However, it is possible to shut down the Nvidia video card to improve battery life. To do that, you have to to compile acpi_call module (https://github.com/mkottman/acpi_call/downloads), then load the module (sudo insmod acpi_call.ko) and type this command in terminal:
sudo echo "\_SB.PCI0.PEG0.GFX0.DOFF" > /proc/acpi/call