From f31625c7a1f14f369056c6abc2f23d1262f77a28 Mon Sep 17 00:00:00 2001 From: ericlay Date: Sun, 15 Mar 2020 08:14:34 -0500 Subject: [PATCH] Samsung Chromebook: update information for sound and brightness (#23) Co-authored-by: Eric Lay --- Samsung_Chromebook.md | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/Samsung_Chromebook.md b/Samsung_Chromebook.md index 0b16afb..642f5de 100644 --- a/Samsung_Chromebook.md +++ b/Samsung_Chromebook.md @@ -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. \ No newline at end of file +On boot, systemd will now set the permissions of that control file to be world writable. Acceptable values are 0-7.