Edit file

File name : org.x.xf86-video-intel.backlight-helper.policy

Content :<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" "http://www.freedesktop.org/standards/PolicyKit/1.0/policyconfig.dtd"> <policyconfig> <vendor>The X.Org project</vendor> <vendor_url>https://01.org/linuxgraphics/community/xf86-video-intel</vendor_url> <icon_name>brightness</icon_name> <action id="org.x.xf86-video-intel.backlight-helper"> <description>Modify lcd panel brightness</description> <message>Authentication is required to modify the lcd panel brightness</message> <defaults> <allow_any>no</allow_any> <allow_inactive>no</allow_inactive> <allow_active>yes</allow_active> </defaults> <annotate key="org.freedesktop.policykit.exec.path">/usr/libexec/xf86-video-intel-backlight-helper</annotate> </action> </policyconfig>

Save