Since the firmware I use is the Arc S one (ICS 4.0.3) - I believe this module will also work for Arc S.
Use it at your own risk!
This was was a difficult one to make, Sony choosed to disable some features within the kernel, but I was able to finally build it correctly so that the phone doesn't reboot.
One more reason I don't like other kernels beside what producer put - they have more 'junk' just because the PC can build it. Sony seems to keep everything very controlled and slim. Replacing the kernel usually puts something not phone optimized.
PS: I will create a small installer with the modules, so you don't have to use other kernels and complex procedure if you want other governors and tun.ko (before this I will build cifs).