Display Brightness Slider for Gnome Shell
install ddcutil
Manually load kernel module i2c-dev
sudo modprobe i2c-dev
ddcutil capabilities | grep "Feature: 10"
/dev/i2c
devicesddcutil 2.0+
sudo cp /usr/share/ddcutil/data/60-ddcutil-i2c.rules /etc/udev/rules.d
Prior ddcutil 1.4.0
sudo cp /usr/share/ddcutil/data/45-ddcutil-i2c.rules /etc/udev/rules.d
Read more: https://www.ddcutil.com/i2c_permissions/
sudo groupadd --system i2c
sudo usermod $USER -aG i2c
i2c-dev
automatically
sudo touch /etc/modules-load.d/i2c.conf
sudo sh -c 'echo "i2c-dev" >> /etc/modules-load.d/i2c.conf'
sudo reboot
This tool uses ddcutil as backend, so first make sure that your user can use use following shell commands without root or sudo.
ddcutil getvcp 10
to check the brightness of a monitor and
ddcutil setvcp 10 100
to set the brightness to 100
It automatically supports multiple displays detected by
ddcutil detect
You can find this extension here
Clone this repo and in the repo's root directory run these shell commands
make build
make install
In my hardware for some reason when ddcutil detect
is ran for the first time after a cold boot and then, when it checks for i2c busno=1, whole system locks for couple of seconds.
As a workaround I changed this extension to read cached info from a file, when it exists.
ddcutil --brief detect > $XDG_CACHE_HOME/ddcutil_detect
This extension is developed and maintained by @daitj