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Step #4 on this post: http://www.webupd8.org/2013/12/things-to-do-after-installing-ubuntu-on.html describes the options to solve this problem. The article says it is because the Keyboard target is not setup correctly.


Okay so brightness works now. With audio it took me a while to figure it out but basically you need to install pulseaudio FIRST, reboot, and then install KMix and reboot again. Now it works :D


Go to the KDE settings ("configure desktop" or "system settings") -> Shortcuts and Gestures -> Global Keyboard Shorcuts. For volume, go to KMix, click "Volume Down" next to "Decrease Volume", click the box next to "Custom", then hit "Volume Down" button on your chromebook. Do the same with "Mute" and "Volume Up". For brightness, go to "KDE Daemon". Set ...


Go to pulseaudio --> output devices --> click on the lock. Worked for me. When hovering over the lock, it says lock channels together.


To use alsamixer from a terminal, F3 gives you all controls, go left and right arrows to select each one. F6 to select soundcard although it looks like it's already selected. One thing to note . . . make sure auto mute is not selected on the alsa mixer. Arrow up and down to control the volume. After installing alsamixer this feature (automute) is set on ...


@dobey's solution works if you want to have only one keyboard shortcut for increasing / decreasing the volume. If instead you want to have multiple key bindings controlling the volume (like to keep the default volume buttons on your laptop working, while adding additional keyboard shortcuts to use when you connect an external keyboard that does not have ...

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