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Added additional information to the Acer Chromebook R13 wiki relating to audio.

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Anders Kirchenbauer 2017-06-15 12:59:07 -04:00
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Acer_Chromebook_R13.md
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## Xorg
* The PowerVR GX6250 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.
* xf86-input-libinput is preferred over evdev and synaptics for the best experience with the touchpad and touchscreen. Touch controls on the touchscreen only align when the screen is in laptop orientation.
## Audio
The following channels must be unmuted for the speakers to work. The alsamixer utility (part of alsa-utils) can be used to do this by navigating with the arrow keys and pressing **m** to unmute the channel.
The following channels must be unmuted for the speakers to work. The alsamixer utility (part of alsa-utils) can be used to do this by navigating with the arrow keys and pressing **m** to unmute the channel. If pulseaudio or similar audio mixers are installed, you must use the F6 key when in alsamixer to switch from pulseaudio to the sound device.
* Speaker Channel
* DAC MIXL DAC L2
@ -30,4 +30,35 @@ The following channels must be unmuted for the speakers to work. The alsamixer
* SPOR MIX DAC R1
* SPOR MIX SPKVOL R
You may also want to decrease the DAC1 gain value, otherwise audio will still be fairly loud at the lowest setting.
Audio via amixer (also included in the alsa-utils package) may automate this a bit. The channels above can be used via number id (cset numid). The numbers corresponding to the above channels are (in order): 1 89 90 88 87 86 85 110 109 108 107 145 144 81 77 68 67 54 53 56 55 51 52
A simple commandline to do this (in BASH or related shells) is:
* for i in 1 89 90 88 87 86 85 110 109 108 107 145 144 81 77 68 67 54 53 56 55 51 52; do amixer -c 0 cset numid=$i on; done
You may also want to decrease the DAC1 (cset numid=10) gain value, otherwise audio will still be fairly loud at the lowest setting.
Headphones:
* HPOVOL L Switch
* HPOVOL R Switch
* HPOVOL MIXL DAC1 Switch
* HPOVOL MIXR DAC1 Switch
* HPO MIX DAC1 Switch
A command for enabling headphones as above is:
* for i in 58 57 63 59 49; do amixer -c 0 cset numid=$i on; done
Muting/Unmuting:
Mute Headphones
* amixer cset numid=4 off
Unmute Headphones
* amixer cset numid=4 on
Mute Speakers
* amixer cset numid=25 off
Unmute Speakers
* amixer cset numid=25 on