--- a/app-misc/ddcutil/ddcutil-0.9.1.ebuild	
+++ a/app-misc/ddcutil/ddcutil-0.9.1.ebuild	
@@ -24,6 +24,7 @@ RDEPEND="dev-libs/glib:2
 		virtual/libusb:1
 		sys-apps/usbutils
 	)
+	user-permissions? ( acct-group/i2c )
 	X? (
 		x11-libs/libXrandr
 		x11-libs/libX11
--- a/app-misc/ddcutil/ddcutil-0.9.5.ebuild	
+++ a/app-misc/ddcutil/ddcutil-0.9.5.ebuild	
@@ -24,6 +24,7 @@ RDEPEND="dev-libs/glib:2
 		virtual/libusb:1
 		sys-apps/usbutils
 	)
+	user-permissions? ( acct-group/i2c )
 	X? (
 		x11-libs/libXrandr
 		x11-libs/libX11
--- a/app-misc/ddcutil/ddcutil-0.9.9.ebuild	
+++ a/app-misc/ddcutil/ddcutil-0.9.9.ebuild	
@@ -25,6 +25,7 @@ RDEPEND="dev-libs/glib:2
 		virtual/libusb:1
 		sys-apps/usbutils
 	)
+	user-permissions? ( acct-group/i2c )
 	X? (
 		x11-libs/libXrandr
 		x11-libs/libX11