Media keys and default keybindings

GalliumOS includes five keyboard layouts customized for Chromebooks. They can be configured from the GalliumOS/Whisker Menu, in Settings >> Keyboard >> Layout >> Keyboard Model.

Media keys and Function keys can be accessed either with or without pressing the "Overlay" key first, depending on your choice of keyboard layout.

Keyboard Layouts

Layout Name	Overlay Key	Top row keys (alone)	Top row keys (with Overlay)
Chromebook / No overlay / F keys mapped to media keys	None	Media keys	Media keys
Chromebook / Right alt overlay	Right-Alt	Function keys	Media keys
Chromebook / Right alt overlay / F keys mapped to media keys ** default for GalliumOS 1.0 and later **	Right-Alt	Media keys	Function keys
Chromebook / Search overlay previous default (1.0beta1), and Crouton default	Super (Search)	Function keys	Media keys
Chromebook / Search overlay / F keys mapped to media key	Super (Search)	Media keys	Function keys

These layouts are stored in /usr/share/X11/xkb/symbols/chromebook* . To modify the functionality of a key, one can make changes to the appropriate file (as root).
For instance, to remap the power key to Delete, add the following line in the appropriate file: key <POWR> {[ Delete ] };, and set the power button to "Do nothing" in the Power Manager menu.

Key Mappings

Key	Combination
F1-F10	Accessed directly or with Overlay, depending on Keyboard layout
F11
F12
Home	Overlay + Left Arrow
End	Overlay + Right Arrow
Page Up	Overlay + Up Arrow
Page Down	Overlay + Down Arrow
Insert	Overlay + .
Delete	Overlay + Backspace
Caps Lock	Right-Alt as Overlay: Overlay + Right Shift Super as Overlay: Overlay + Left Alt

Crouton keyboard layout: https://github.com/dnschneid/crouton/wiki/Keyboard

Other discussion: https://github.com/GalliumOS/galliumos-distro/issues/50

Keyboard Shortcuts

Key	Combination
Screenshot (fullscreen)	Ctrl + F5(display)
Screenshot (window)	Ctrl + Shift + F5(display)
Whisker Menu/Search	Right-Alt as Overlay: Super + M Super as Overlay: Left-Alt + M
Keyboard Backlight Toggle	Overlay + 0 (not working!)
Keyboard Backlight Brightness Down	Overlay + -
Keyboard Backlight Brightness Up	Overlay + =