I installed and booted http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc5-saucy/linux-image-3.12.0-031200rc5-generic_3.12.0-031200rc5.201310131952_amd64.deb, and now Fn+F3 (wifi switch) and Fn+F7 (touchpad switch) work, but Fn+left/right (brightness) still doesn't work.
I installed and booted http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v3.12-rc5- saucy/linux- image-3. 12.0-031200rc5- generic_ 3.12.0- 031200rc5. 201310131952_ amd64.deb, and now Fn+F3 (wifi switch) and Fn+F7 (touchpad switch) work, but Fn+left/right (brightness) still doesn't work.