Setting up Arch Linux on HP chromebook 11

Setting up laptop

Arch wiki

• About laptop
• ACPI

backlight

$ ls /sys/class/backlight/
$ ps8622-backlight
This is the directory for controlling my HP chromebook11's backlight. The name depends on the graphics card. intel_backlight for intel graphics card, acpi_video0 on an ATI card. I eventually found mine is from a company called Parade. A company from Taiwan.

moving on.

$ ls /sys/class/backlight/ps8622-backlight
$ actual_brightness brightness max_brightness ....
What is the maximum value of brightness
$ cat /sys/class/backlight/ps8622-backlight/max_brightness
$ 255
What is actual? $ cat /sys/class/backlight/ps8622-backlight/actual_brightness

The brightness can be set by writing number to brightness. It is possible to go any higher than the maximum brightness
$ tee /sys/class/backlight/ps8622-backlight/brightness <<< 35

touchpad

• xorg.conf
• about synaptics
• https://wiki.debian.org/SynapticsTouchpad
• http://www.x.org/archive/X11R7.5/doc/man/man4/synaptics.4.html
• http://www.uplawski.eu/technology/linux/touchpad_en.html

Trying to enable touch pad actions like tap to click, two finger scroll or so

Current settings are in the configuration file downloaded from here when installing the system

It is found in /etc/X11/xorg.conf.d

Check out available input-device and their ids

$ xinput --list

and verify the properties of touch pad device

$ xinput --list-props 8

It shows Synaptics Tap Action (261): 0, 0, 0, 0, 0, 0, 0

It's weird because I set up TapButton1 to TapButton3 in conf file (/etc/X11/xorg.conf.d/50-synaptics.conf).
I can enable tap action via
$ synclient "TapButton1"="1"
So it's not that my touchpad is not configurable but somehow it fails to configure at boot process by .conf file
I found it is because I'm using MATE as desktop environment. MATE needs some setting for enabling configure touchpad right. (see here)