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brightness control with ddcci and gnome slider

cn flag

I have connected an external touch to my mini pc. DDCCI module seems to work for me.

eg

echo 90 > /sys/class/backlight/ddcci5/brightness

results in a change of brightness. But unfortunately I cannot use the slider. The slider still controls intel_backlight. How can I change the slider to ddcci5? Is there a way to suppress the intel device to be populated during startup? acpi_brightness=none didn't work out.

Thanks for any hint

mangohost

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