My laptop is running Lubuntu. It used to have this file: /sys/class/backlight/acpi_video0/brightness
but it's now replaced with this: /sys/class/backlight/samsung/brightness (in other words, the acpi_video folder is replaced with samsung folder) Now I can't used the Fn key + up or down arrow to adjust brightness. 1. Is this due to recent updates? 2. I recently installed another desktop environment in my Lubuntu, which proved to be buggy, so I uninstalled it. I wonder if it has anything to do with Fn key not working? 3. The Fn key + right or left arrow button to adjust sound works fine; only problem is the brightness adjustment (Fn + up or down arrow) Any ideas?
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