change screen brightness on battery and ac power on Sid

[glarue]

I was on Debian 8 (Jessie), and I believe the way I was controlling differential screen brightness on battery/ac power was through a short script in /etc/pm/power.d/ which looked like this:

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#!/bin/bash
case $1 in
	true) #on battery
		echo 250 > /sys/class/backlight/intel_backlight/brightness
		;;
	false) #on ac
		echo 937 > /sys/class/backlight/intel_backlight/brightness
		;;
esac

Now, I have switched to Debian Unstable, and it seems to have broken that functionality. I've identified "intel_backlight" as the correct device, and it changes if I use the following command:

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echo <int> | sudo tee /sys/class/backlight/intel_backlight/brightness

The script, however, no longer seems to have any effect. I've Googled around extensively but can't seem to find the right advice for the newer Debian sources.

[phenest]

I have a Dell XPS 17 and the brightness control didn't work on Stretch, so I added this to the kernel boot parameters:

Code: Select all

acpi_backlight=video

[debiman]

Now, I have switched to Debian Unstable, and it seems to have broken that functionality.

i'd suggest you use systemd functionality to get that working again.

the top results look relevant:
https://duckduckgo.com/?q="systemd"+scr ... op+battery