diff --git a/modules/installer/cd-dvd/installation-cd-graphical.nix b/modules/installer/cd-dvd/installation-cd-graphical.nix
index 629167f8aca..aa49c8e9848 100644
--- a/modules/installer/cd-dvd/installation-cd-graphical.nix
+++ b/modules/installer/cd-dvd/installation-cd-graphical.nix
@@ -11,4 +11,8 @@
 
   # Provide wicd for easy wireless configuration.
   networking.wicd.enable = true;
+
+  # KDE complains if power management is disabled (to be precise, if
+  # there is no power management backend such as upower).
+  powerManagement.enable = true;
 }