1 files changed, 14 insertions, 0 deletions

diff --git a/system.scm b/system.scm
index 90e99ab..2c2a444 100644
--- a/system.scm
+++ b/system.scm
@@ -26,6 +26,15 @@
                     (list "sudo" "nano")))
           %base-packages ))
 
+(define %backlight-udev-rule
+  (udev-rule
+    "90-backlight.rules"
+    (string-append "ACTION==\"add\", SUBSYSTEM==\"backlight\", "
+                   "RUN+=\"/run/current-system/profile/bin/chgrp video /sys/class/backlight/%k/brightness\""
+                   "\n"
+                   "ACTION==\"add\", SUBSYSTEM==\"backlight\", "
+                    "RUN+=\"/run/current-system/profile/bin/chmod g+w /sys/class/backlight/%k/brightness\"")))
+
 (operating-system
   (kernel linux)
   (firmware (list linux-firmware))
@@ -108,6 +117,11 @@
                                                          (q #C1FD53E5D4CE971933EC50C9F307AE2171A2D3B52C804642A7A35F84F3A4EA98#)
                                                         )
                                                        )" ) %default-authorized-guix-keys))))
+    (udev-service-type config =>
+                (udev-configuration
+                  (inherit config)
+                  (rules (cons %backlight-udev-rule
+                               (udev-configuration-rules config)))))
     (delete pulseaudio-service-type)
     (delete gdm-service-type) )))
   (setuid-programs