fix no audio of linux mint 17 on toshiba chromebook 2014

original instruction: https://erdnaxe.github.io/chromebook-linux/

This section is based on this ArchLinux bug thread.

The Intel Atom Processor Audio Controller chtmax98090 works natively under Linux 4.15 but it isn’t properly configured out of the box. This results in no correct mixer control making sound unusable.

To make audio works you can use plbossart’s Alsa Use Case Manager configuration:

git clone https://github.com/plbossart/UCM.git
sudo cp -rv UCM/chtmax98090 /usr/share/alsa/ucm
alsactl kill quit
alsactl init
pulseaudio --kill
pulseaudio --start