I don't have a Asus C200, but I just installed Elementary OS on my Acer C720p. Some of the following parts are hardware dependent. You may want to check this for your Chromebook on Google, but I hope this gives you a viable start anyway.
Enable the developer mode in ChromeOS. Please check how you can do this.
Open a "real" shell, i.e. press alt+ctrl+t and ...
You can try to install elementary OS on Chromebook one of the following methods:
ChromeeOS - elementary OS Luna installation script for Chromebooks
ChromeeOS will install elementary OS (with ChrUbuntu) and apply automatically all the necessary fixes to run elementary OS on Chromebooks. You will be able to boot in ChromeOS or elementary OS on your Chromebook.
I've had this happen on my Dell, though it's not a chromebook, but maybe a similar issue. Speakers work, but not the headphones, I was able to fix it by plugging in the headphones and executing alsactl restore
I am using a Toshiba Chromebook 2 with Loki 0.4, I've installed Tweaks and used this to fix my top row key commands "http://www.fascinatingcaptain.com/blog/automate-chromebook-fixes-for-linux/" The brightness keys work however they don't affect anything other than the overlay that increases or decreases the brightness, and the keyboard backlight is broken on ...
The automated fix as shared in below link made all the media keys work in my installation of Loki on C720. There are a few additional fixes included, you might want to adjust the script where you find necessary.
This is a confirmed bug that located here. I have found the best way to deal with this bug without rebooting is to switch your TTY (CTRL-ALT-F1) and run sudo killall lightdm. It should switch you back to the login screen and you should be able to log in and get back to your desktop.
AFAIK this is about the kernel issues. In some devices (Chromebooks), a newer kernel will solve the problem, but others no.
I guess you are using BOOT_STUB or full rom firmware. Changing it to RW_LEGACY firmware may help.
Here are some links about this problem:
Touchegg is made for synaptic driver for
touchpads. Loki uses libinput instead. There is a project https://github.com/bulletmark/libinput gestures
I haven't tried it. I just installed synaptics drive and used it with xSwipe but it should work with Touchegg too. If libinput gestures doesn't work for you. Let me know. I kept notes on how I set up xSwipe ...