The codec and the wiring on this laptop are identical to N75SF, which I 
recently purchased. 
Attached is the draft patch that fixes most of the troubles and adds more 
controls. 
Features: 
* Automute toggling for headphone plug
* HP jack retasking for mic-in/hp-out/line-out/line-in.
* Subwoofer amp toggling (off in 2 channel mode => saves battery)
* LFE volume regulation
Those retarded ‘genius’ guys from asus decided to wire the internal mic to the 
jack on the codec that can be configured as line-out, while external mic can 
only work as a mic.

Sensing of subwoofer presense doesn’t work yet. I just couldn’t make sense how 
it works: it’s not acpi, not codec’s GPIO, not regular pin presense of PIN 0×16.
I'm cleaning up the code before sending it to alsa devel. 
external mic-in, spdif and line-in of HP pin needs testing, I don't have the 
hardware along with me at the moment. If someone can do it - plz drop me a 
note, so that I can fix it. 
Patch is against kernel 3.1.6 (tested in Agilia Linux, I don't use 
ubuntu/kubuntu any more, sorry)
 

** Patch added: "Draft patch against 3.1.6. Still needs some testing and 
cleanup"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/871808/+attachment/2655803/+files/n75sf.patch

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https://bugs.launchpad.net/bugs/871808

Title:
  Asus N55SF - External subwoofer not working

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