wiki/Samsung_Chromebook_Plus.md

## 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.

If using pulseaudio, the following can be placed in your `~/.config/pulse/default.pa` file to create a loopback device that fixes the volume levels, so that 0-100% in a desktop environment's volume bar will correspond to the audio level heard in the spaker.

```
.include /etc/pulse/default.pa
  
load-module module-null-sink sink_name=corrected_speakers sink_properties=device.description=corrected_speakers

load-module module-loopback source=corrected_speakers.monitor sink=alsa_output.platform-sound.stereo-fallback remix=false

set-sink-volume alsa_output.platform-sound.stereo-fallback 6553

set-default-sink corrected_speakers
```
added Samsung Chromebook Plus 2017-03-14 01:48:24 +00:00			`## 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.`
default.pa for Samsung Chromebook Plus (#14) Include a default.pa file which corrects the volume level for the Samsung Chromebook Plus so that volume hotkeys and volume sliders in the desktop environment behave correctly over 0-100%. 2018-02-21 20:43:07 +00:00
			If using pulseaudio, the following can be placed in your `~/.config/pulse/default.pa` file to create a loopback device that fixes the volume levels, so that 0-100% in a desktop environment's volume bar will correspond to the audio level heard in the spaker.

			```
			`.include /etc/pulse/default.pa`

			`load-module module-null-sink sink_name=corrected_speakers sink_properties=device.description=corrected_speakers`

			`load-module module-loopback source=corrected_speakers.monitor sink=alsa_output.platform-sound.stereo-fallback remix=false`

			`set-sink-volume alsa_output.platform-sound.stereo-fallback 6553`

			`set-default-sink corrected_speakers`
			```