(I edited this question to make it more useful for everyone)
In order to make the keyboard of my Medion P2213T work I have to recompile the elementary kernel with just a very small adjustment, namely changing the value HID_MAX_USAGES
to 65536
in include/linux/hid.h
.
I tried a tutorial for Ubuntu 14.04, I ended up with a working keyboard, but the new kernel had horrible performance even on the desktop...
So my question, is there an easy tutorial to recompile the kernel, known to work with the latest version of elementary OS freya?