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Samsung Chromebook: update information for sound and brightness (#23)

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Co-authored-by: Eric Lay <ericlaytm@gmail.com>
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ericlay 2020-03-15 08:14:34 -05:00 committed by GitHub
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Samsung_Chromebook.md
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@ -15,9 +15,23 @@ EndSection
1. Install alsa-utils: `pacman -S alsa-utils`
2. Run alsamixer as root.
3. Arrow right until you see four items starting with Left Speaker Mixer, and press M on all four channels to un-mute them.
4. Arrow right some more until you find four more starting with Right Speaker Mixer and un-mute them as well.
5. Arrow all the way back left to the Speaker channel and raise the volume a little. Keep it low (< 50ish), since alsa will let you get dangerously high for these speakers.
3. Select correct sound card by pressing F6 and selecting '0 Snow-I2S-MAX98095'
4. Arrow right until you see four items starting with Left Speaker Mixer, and press M on all four channels to un-mute them.
5. Arrow right some more until you find four more starting with Right Speaker Mixer and un-mute them as well.
6. Arrow all the way back left to the Speaker channel and raise the volume a little. Keep it low (< 50ish), since alsa will let you get dangerously high for these speakers.
Alternatively, the following commands can be issued per channel to amixer. Requires alsa-utils as well.
```
amixer -c 0 set 'Right Speaker Mixer Right DAC1' unmute
amixer -c 0 set 'Right Speaker Mixer Mono DAC3' unmute
amixer -c 0 set 'Right Speaker Mixer Mono DAC2' unmute
amixer -c 0 set 'Right Speaker Mixer Left DAC1' unmute
amixer -c 0 set 'Left Speaker Mixer Right DAC1' unmute
amixer -c 0 set 'Left Speaker Mixer Mono DAC3' unmute
amixer -c 0 set 'Left Speaker Mixer Mono DAC2' unmute
amixer -c 0 set 'Left Speaker Mixer Left DAC1' unmute
```
## Suspend when closing the lid
@ -45,10 +59,10 @@ Closing the lid will now trigger a suspend, and opening it will wake the system.
## User permissions for backlight control
To allow all users to modify the backlight control at */sys/class/backlight/pwm-backlight.0/brightness*, create and edit the file */etc/tmpfiles.d/brightness.conf* with these contents:
To allow all users to modify the backlight control at */sys/class/backlight/backlight/brightness*, create and edit the file */etc/tmpfiles.d/brightness.conf* with these contents:
```
f /sys/class/backlight/pwm-backlight.0/brightness 0666 - - - 800
f /sys/class/backlight/backlight/brightness 0666 - - - 800
```
On boot, systemd will now set the permissions of that control file to be world writable. Acceptable values are 0-2800.
On boot, systemd will now set the permissions of that control file to be world writable. Acceptable values are 0-7.