http://permalink.gmane.org/gmane.linux.gentoo.user/255182 seems to imply an echo 0 > /sys/class/backlight/intel_backlight/brightness fixes the acpi_video0 interface
http:// permalink. gmane.org/ gmane.linux. gentoo. user/255182 seems to imply an echo 0 > /sys/class/ backlight/ intel_backlight /brightness fixes the acpi_video0 interface