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wiki/Samsung_Chromebook.md
ericlay f31625c7a1
Samsung Chromebook: update information for sound and brightness (#23) 
Co-authored-by: Eric Lay <ericlaytm@gmail.com>
2020-03-15 07:14:34 -06:00

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Better touchpad responsiveness

Create the file /etc/X11/xorg.conf.d/50-touchpad.conf and add the following to it:

Section "InputClass"
        Identifier              "touchpad"
        MatchIsTouchpad         "on"
        Option                  "FingerHigh"    "5"
        Option                  "FingerLow"     "5"
EndSection

Enable audio

  1. Install alsa-utils: pacman -S alsa-utils
  2. Run alsamixer as root.
  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

Install acpid and pm-utils: pacman -S acpid pm-utils

Edit /etc/acpi/handler.sh and near the bottom you'll see the button/lid section. Add pm-suspend to the close section to look like:

button/lid)
    case "$3" in
        close)
            logger 'LID closed'
            pm-suspend
            ;;

Enable and start acpid:

systemctl enable acpid
systemctl start acpid

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/backlight/brightness, create and edit the file /etc/tmpfiles.d/brightness.conf with these contents:

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 0-7.