StumpWM ACPI-Backlight

ACPI backlight control module for StumpWM.

Installation

cd ~/.stumpwm.d/modules/
git clone https://github.com/Junker/stumpwm-acpi-backlight acpi-backlight

get name of your backlight device:

$ ls /sys/class/backlight
intel_backlight

add lisp code:

(stumpwm:add-to-load-path "~/.stumpwm.d/modules/acpi-backlight")
(load-module "acpi-backlight")
(acpi-backlight:init "intel_backlight") ; use name of your ACPI backlight device

Usage

  (define-key *top-map* (kbd "XF86MonBrightnessUp") "backlight-up")
  (define-key *top-map* (kbd "XF86MonBrightnessDown") "backlight-down")

Additional commands

• backlight-set value

Additional functions

• get-brightness
• get-brightness-pct
• set-brightness
• set-brightness-pct

Parameters

• acpi-backlight:*step* - brightness increase/decrease percent step

Modeline

%Q - backlight formatter

Modeline mouse interaction

• wheel up: brightness up
• wheel down: brightness down

Troubleshooting

Sometimes only root can change the brightness by this method. To allow users in the video group to change the brightness, a udev rule such as the following can be used:

$ cat /etc/udev/rules.d/backlight.rules
ACTION=="add", SUBSYSTEM=="backlight", RUN+="/bin/chgrp video $sys$devpath/brightness", RUN+="/bin/chmod g+w $sys$devpath/brightness"

Then you need to add your user to the video group.

usermod -aG video <user>