The following changes were made:

* /etc/modprobe.d added
  * blacklist.conf and usb.conf added
  * usher added to manage blacklist.conf and usb.conf

SNAP/blacklist.conf

@@ -0,0 +1,2 @@
+blacklist pcspkr
+blacklist cirrusfb

SNAP/usb.conf

@@ -0,0 +1,2 @@
+install ohci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe -i ohci_hcd ; true
+install uhci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe -i uhci_hcd ; true

SNAP/usher

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -e
+
+case $1 in
+  preinst)
+    exit 0
+    ;;
+  postinst)
+    if [ ! -f ${TARGET}/etc/modprobe.d/blacklist.conf ]; then
+      cp ${TARGET}/usr/share/kmod/blacklist.conf \
+        ${TARGET}/etc/modprobe.d/blacklist.conf
+    fi
+
+    if [ ! -f ${TARGET}/etc/modprobe.d/usb.conf ]; then
+      cp ${TARGET}/usr/share/kmod/usb.conf \
+        ${TARGET}/etc/modprobe.d/usb.conf
+    fi
+    ;;
+  prerm)
+    exit 0
+    ;;
+  postrm)
+    exit 0
+    ;;
+esac