I did all those steps exept
sudo gedit /lib/udev/rules.d/95-keymap.rules
on my samsung x360 and there is some result. Previously when I tried to change brightness by fn+up/down the notification showed up but, my desktop stopped recognising keyboard keys any more but the brightness remained unchanged. Now the notification doesnt show up but at least my desktop doesnt go weird with the keyboard, the brightness of course doesnt change.
More over the brightness applet on my gnome panel now says it cant recognize laptops brightness level. Previously I was able to change the values (with no real brightness change).
The whole thing must be working somehow couse I can switch on and of my bluetooth for example but I would be really glad if You could help me with my case.
I'm using ubuntu 10.04 (linux mint actually) I tried many different kernels and nothing helps.