diff --git a/etc/manifests/cross-compile.scm b/etc/manifests/cross-compile.scm
index 44a6407b0c3..776da581cf9 100644
--- a/etc/manifests/cross-compile.scm
+++ b/etc/manifests/cross-compile.scm
@@ -71,18 +71,21 @@ TARGET."
          "connman" "network-manager" "wpa-supplicant" "isc-dhcp" "cups"
          "linux-libre" "grub-hybrid")))
 
-(define %system-gui-packages
+(define (%system-gui-packages target)
   ;; Key packages proposed by the Guix System installer.
   (append (map specification->package
                '(;; build system `python' does not support cross builds
-                 ;"gnome" "xfce" "mate" "openbox"
+                                        ;"gnome" "xfce" "mate" "openbox"
                  "awesome"
                  "i3-wm" "i3status" "dmenu" "st"
                  "ratpoison" "xterm"
                  ;; build system `emacs' does not support cross builds
-                 ;"emacs-exwm" "emacs-desktop-environment"
+                                        ;"emacs-exwm" "emacs-desktop-environment"
                  "emacs"))
-          %default-xorg-modules))
+          ;; NOTE: %default-xorg-modules depends on system.
+          (parameterize
+              ((%current-target-system target))
+            %default-xorg-modules)))
 
 (define %packages-to-cross-build
   ;; Packages that must be cross-buildable from x86_64-linux.
@@ -151,7 +154,8 @@ TARGET."
                                  ;; With a graphical environment:
                                  (if (or (target-x86-32? target)
                                          (target-aarch64? target))
-                                     %system-gui-packages
+                                     ;; %system-gui-packages depends on the system.
+                                     (%system-gui-packages target)
                                      '()))))
                   (fold delete (map platform-system->target (systems))
                         '(;; Disable cross-compilation to self:
diff --git a/gnu/services/xorg.scm b/gnu/services/xorg.scm
index b32a960bcf6..25f44566beb 100644
--- a/gnu/services/xorg.scm
+++ b/gnu/services/xorg.scm
@@ -64,6 +64,7 @@
   #:use-module ((guix modules) #:select (source-module-closure))
   #:use-module (guix packages)
   #:use-module (guix derivations)
+  #:use-module (guix platform)
   #:use-module (guix records)
   #:use-module (guix deprecation)
   #:use-module (guix utils)
@@ -148,25 +149,36 @@
 ;;;
 ;;; Code:
 
-(define %default-xorg-modules
-  ;; Default list of modules loaded by the server.  When multiple drivers
-  ;; match, the first one in the list is loaded.
-  (list xf86-video-vesa
-        xf86-video-fbdev
-        xf86-video-amdgpu
-        xf86-video-ati
-        xf86-video-cirrus
-        xf86-video-intel
-        xf86-video-mach64
-        xf86-video-nouveau
-        xf86-video-nv
-        xf86-video-sis
+(define* (default-xorg-modules
+           #:optional
+           (system (or (and=>
+                        (%current-target-system)
+                        platform-target->system)
+                       (%current-system))))
+  "Default list of modules loaded by the server.  When multiple drivers match,
+the first one in the list is loaded."
+  ;; Return only supported packages, because some aren't supported
+  ;; on all architectures.
+  (filter (cut supported-package? <> system)
+          (list xf86-video-vesa
+                xf86-video-fbdev
+                xf86-video-amdgpu
+                xf86-video-ati
+                xf86-video-cirrus
+                xf86-video-intel
+                xf86-video-mach64
+                xf86-video-nouveau
+                xf86-video-nv
+                xf86-video-sis
 
-        ;; Libinput is the new thing and is recommended over evdev/synaptics:
-        ;; <http://who-t.blogspot.fr/2015/01/xf86-input-libinput-compatibility-with.html>.
-        xf86-input-libinput
-        xf86-input-evdev
-        xf86-input-mouse))
+                ;; Libinput is the new thing and is recommended over evdev/synaptics:
+                ;; <http://who-t.blogspot.fr/2015/01/xf86-input-libinput-compatibility-with.html>.
+                xf86-input-libinput
+                xf86-input-evdev
+                xf86-input-mouse)))
+
+(define-syntax %default-xorg-modules
+  (identifier-syntax (default-xorg-modules)))
 
 (define %default-xorg-fonts
   ;; Default list of fonts available to the X server.