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(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?

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The kernel should be identical to the Ubuntu 14.04's kernel. elementary is built on on Ubuntu Minimal, so an Ubuntu tutorial should work just fine.

That said, a new version of the kernel is coming to Ubuntu 14.04 this month.
That upgrade expands hardware support, so it might fix your problem!

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    You can already install the new kernel with sudo apt-get install linux-image-generic-lts-vivid – John Guerreiro Aug 11 '15 at 13:30
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    @JohnGuerreiro that's not the point, elementary wants to compile a kernel with special adjustments. – Rafael Aug 11 '15 at 15:07
  • @Rafael I understand, that's why I didn't add it as an answer, it was merely an addition to Ryan's answer "That said, a new version of the kernel is coming to Ubuntu 14.04 this month. That upgrade expands hardware support, so it might fix your problem!" – John Guerreiro Aug 11 '15 at 15:17
  • @JohnGuerreiro Careful, it's not quite that simple. There aren't currently the matching graphics stacks for that, which can cause serious issues in some circumstances. – Lewis Goddard Aug 11 '15 at 15:50
  • @Lewis Goddard there aren't? Been using xserver-xorg-lts-vivid for a week, unless I'm getting confused, in that case please correct me. – John Guerreiro Aug 11 '15 at 20:41

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