Take the 2-minute tour ×  I'm currently migrating to openbox
without gnome session. In unity i can use the vendor keys to set
the screen brightness, but in openbox I'm on my own.    •
/sys/class/backlight/acpi_video0/brightness works fine, the
problem is that I need sudo to set the brightness and that
wouldn't work with keyboard mappings.   • xbacklight -get/set
doesn't do or output anything.   • I don't really want to use
xrandr --brightness.  Are there any other options or a way to
fix the problems with xbacklight or acpi_video0 ?  share|improve
this question add comment  2 Answers  up vote 2 down vote
accepted  My solution was to add the following line to
etc/rc.local:  chmod a+w /proc/acpi/video/VID/LCD/brightness  I
don't know if permissions can also be changed in the /sys
filesystem.  share|improve this answer Doesn't feel that good to
mess around with permissions there but the show must go on.
Thanks eldering. –  zls Apr 8 '12 at 12:27 /proc/acpi is
obsolete, and recent kernel versions disable it by de