Ubuntu – get kernel source code

This is related to a new driver introduced in Fedora 20 that does not need more than those two governors. See this thread CPU Governors - where is ONDEMAND? for details.

To have the missing governors, you should boot with the kernel parameter intel_pstate=disable.

To do so, in the GRUB boot screen, choose "edit boot commandline" and add this to the line which starts with kernel. You can also add it permanently to the grub config file.

Note that normally you should not need others governors than those proposed by the new driver which does its job perfectly.

You are basically on the right track, but there's no need to compile a complete kernel, that would be overkill. Usually dkms is used to automatically build one or more kernel modules for newly booted kernels.

So you would need to create a dkms configuration only for the kernel module that you want to patch, and then place the kernel module sourcecode that should be patched under /usr/src/modulename-version together with the patch and the dkms configuration.

If you want to pursue this path, you should have a look at the dkms man page or maybe the *buntu-specific dkms documentation and look at some of the existing dkms packages and adapt for your situation.

But you don't need to reinvent the wheel, please check if this fix applies in your case: https://hardc0l2e.wordpress.com/2014/12/06/fix-for-elantech-touchpad-on-ubuntu-14-04/ which is also mentioned at https://askubuntu.com/questions/541188/how-can-i-get-two-finger-scrolling-working-on-my-trackpad and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1166442 and via http://www.evilcodingmonkey.com/2014/01/23/ubuntu-activate-multi-touch-on-elantech/