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C101PA backlight control

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Kevin Mihelich 2017-12-07 21:07:46 -07:00
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Asus_Chromebook_Flip_C101PA.md
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@ -11,3 +11,12 @@ 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`.