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neversun/linux-fedora-brightness-ddcutil.md

Last active February 7, 2026 14:58
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Brightness control monitor BenQ EX2710Q Fedora 43 Gnome 49
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linux-fedora-brightness-ddcutil.md

Brightness control monitor BenQ EX2710Q Fedora 43 Gnome 49

Install extension

https://extensions.gnome.org/extension/2645/brightness-control-using-ddcutil/

verify monitor can be controlled

sudo dnf install ddcutil sudo ddcutil detect sudo ddcutil capabilities | grep "Feature: 10"

give current user the right to access without sudo

sudo nano /etc/udev/rules.d/60-ddcutil-i2c.rules

add line in nano

KERNEL=="i2c-[0-9]*", GROUP="i2c", MODE="0660"

check for errors?

sudo udevadm control --reload-rules && sudo udevadm trigger

add user to i2c group with access rights

sudo groupadd --system i2c sudo usermod -G i2c -a $USER

reboot to apply

reboot

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