Try to change it using commands, like those shown here: http://askubuntu.com/questions/149054/how-to-change-lcd-brightness-from-command-line-or-via-script
This way you might be able to figure out if is a shortcut problem or another problem... 2015-09-27 1:57 GMT-03:00 Marlon Ng <[email protected]>: > 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? > > -- > Lubuntu-users mailing list > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/lubuntu-users > >
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