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wiki/Asus_Chromebook_Flip_C101PA.md
Kevin Mihelich df4d2bab47 C101PA backlight control
2017-12-07 21:07:46 -07:00

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Xorg

  • The Mali T860MP4 GPU is not supported at this time. Therefore, no particular Xorg drivers are needed. The built in modesetting driver will correctly detect the display.
  • xf86-input-libinput is preferred over evdev and synaptics for the best experience with the touchpad and touchscreen.

Audio

Use alsaucm (part of the alsa-utils package) to set up the sound card:

ALSA_CONFIG_UCM=/opt/alsa/ucm alsaucm -c rk3399-gru-sound set _verb HiFi

Note that the port will display as "Headphones" despite using the speakers. When paired with pulseaudio and pulseaudio-alsa, be aware that the full volume range is addressed through levels 0-9 of the Master volume control. Levels 10-100 provide no additional gain.

Backlight control

Add this udev rule at /etc/udev/rules.d/backlight.rules, and add your user to the video group.

SUBSYSTEM=="backlight",RUN+="/usr/bin/chgrp video /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power",RUN+="/usr/bin/chmod 664 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power"

This will allow you to change the backlight brightness by writing values from 0 to 65535 to /sys/class/backlight/backlight/brightness.