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How to know which /proc file is used to set the backlight ?

$ ls -1F /proc/acpi/ returns :

ac_adapter/
battery/
button/
event
wakeup

xbacklight works.

I use awesomeWM with Ubuntu 12.04, on a dell laptop. The keyboard backlight control touches don't work even though it worked well under Debian.

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1 Answer 1

Reset to default
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None of them. Modern Linux kernels expose hardware settings through /sys, and backlight "devices" usually can be found at /sys/class/backlight, each having a …/brightness parameter that controls the brightness level.

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