diff -Nru cups-1.5.3/debian/changelog cups-1.5.3/debian/changelog
--- cups-1.5.3/debian/changelog	2012-12-05 21:23:53.000000000 +0100
+++ cups-1.5.3/debian/changelog	2013-05-10 19:51:53.000000000 +0200
@@ -1,3 +1,22 @@
+cups (1.5.3-0ubuntu8) precise-proposed; urgency=low
+
+  * debian/patches/usb-backend-do-not-crash-if-usb-disabled-in-bios.patch:
+    Add patch to test suite to ignore the newly introduced warning message.
+    This message gets regularly issued on build servers which use virtual
+    machines without access to the host's USB and so the test suite fails due
+    to an extra warning. Due to this there was a FTBFS in the previous release
+    (LP: #1108719).
+
+ -- Till Kamppeter <till.kamppeter@gmail.com>  Fri, 10 May 2013 19:51:56 +0200
+
+cups (1.5.3-0ubuntu7) precise-proposed; urgency=low
+
+  * debian/patches/usb-backend-do-not-crash-if-usb-disabled-in-bios.patch:
+    Added more error handling to the libusb-based USB backend, especially to
+    avoid a crash when USB is disabled in the BIOS (LP: #1108719).
+
+ -- Till Kamppeter <till.kamppeter@gmail.com>  Thu, 25 Apr 2013 12:34:56 +0200
+
 cups (1.5.3-0ubuntu6) precise-proposed; urgency=low
 
   * debian/patches/airprint-support.patch: Made AirPrint support also working
diff -Nru cups-1.5.3/debian/patches/series cups-1.5.3/debian/patches/series
--- cups-1.5.3/debian/patches/series	2012-11-30 16:12:45.000000000 +0100
+++ cups-1.5.3/debian/patches/series	2013-04-25 20:41:45.000000000 +0200
@@ -6,6 +6,7 @@
 
 # patches sent upstream
 usb-backend-reset-after-job-only-for-specific-devices.patch
+usb-backend-do-not-crash-if-usb-disabled-in-bios.patch
 pidfile.patch
 ppd-poll-with-client-conf.patch
 # no answer yet, po4a might not be appropriate
diff -Nru cups-1.5.3/debian/patches/tests-ignore-warnings.patch cups-1.5.3/debian/patches/tests-ignore-warnings.patch
--- cups-1.5.3/debian/patches/tests-ignore-warnings.patch	2012-05-23 15:26:27.000000000 +0200
+++ cups-1.5.3/debian/patches/tests-ignore-warnings.patch	2013-05-10 19:46:05.000000000 +0200
@@ -1,16 +1,14 @@
 Description: Ignore warnings from colord and Avahi in the tests, as they change the expected number of warnings.
 Author: Martin Pitt <mpitt@debian.org>
 
-Index: cups-1.5.2/test/run-stp-tests.sh
-===================================================================
---- cups-1.5.2.orig/test/run-stp-tests.sh	2012-03-01 07:16:41.180825081 +0100
-+++ cups-1.5.2/test/run-stp-tests.sh	2012-03-01 07:17:29.660827422 +0100
+--- a/test/run-stp-tests.sh
++++ b/test/run-stp-tests.sh
 @@ -764,7 +764,7 @@
  fi
  
  # Warning log messages
--count=`$GREP '^W ' /tmp/cups-$user/log/error_log | wc -l | awk '{print $1}'`
-+count=`$GREP '^W ' /tmp/cups-$user/log/error_log | grep -v 'org.freedesktop.ColorManager' | grep -v 'Avahi client failed: -26' | wc -l | awk '{print $1}'`
+-count=`$GREP '^W ' /tmp/cups-$user/log/error_log | grep -v 'Unable to initialize USB access via libusb, libusb error' | wc -l | awk '{print $1}'`
++count=`$GREP '^W ' /tmp/cups-$user/log/error_log | grep -v 'Unable to initialize USB access via libusb, libusb error' | grep -v 'org.freedesktop.ColorManager' | grep -v -E 'Avahi client failed: -(1|26)' | wc -l | awk '{print $1}'`
  if test $count != 9; then
  	echo "FAIL: $count warning messages, expected 9."
  	$GREP '^W ' /tmp/cups-$user/log/error_log
diff -Nru cups-1.5.3/debian/patches/usb-backend-do-not-crash-if-usb-disabled-in-bios.patch cups-1.5.3/debian/patches/usb-backend-do-not-crash-if-usb-disabled-in-bios.patch
--- cups-1.5.3/debian/patches/usb-backend-do-not-crash-if-usb-disabled-in-bios.patch	1970-01-01 01:00:00.000000000 +0100
+++ cups-1.5.3/debian/patches/usb-backend-do-not-crash-if-usb-disabled-in-bios.patch	2013-05-10 19:45:12.000000000 +0200
@@ -0,0 +1,54 @@
+Description: Add more error handling to the libusb-based USB backend,
+ especially to avoid a crash when USB is disabled in the BIOS. Also
+ discard that error when counting warning messages.
+Author: Till Kamppeter <till.kamppeter@gmail.com>
+Bug-Ubuntu: https://bugs.launchpad.net/bugs/1108719
+Last-Update: 2013-05-03
+--- a/backend/usb-libusb.c
++++ b/backend/usb-libusb.c
+@@ -824,7 +824,8 @@
+ 					/* Pointer to current alternate setting */
+   const struct libusb_endpoint_descriptor *endpptr = NULL;
+ 					/* Pointer to current endpoint */
+-  ssize_t               numdevs,        /* number of connected devices */
++  ssize_t               err = 0,
++                        numdevs,        /* number of connected devices */
+                         i = 0;
+   uint8_t		conf,		/* Current configuration */
+ 			iface,		/* Current interface */
+@@ -843,7 +844,13 @@
+   * Initialize libusb...
+   */
+ 
+-  libusb_init(NULL);
++  err = libusb_init(NULL);
++  if (err)
++  {
++    fprintf(stderr, "WARNING: Unable to initialize USB access via libusb, libusb error %i\n", err);
++    return (NULL);
++  }
++
+   numdevs = libusb_get_device_list(NULL, &list);
+   fprintf(stderr, "DEBUG: libusb_get_device_list=%d\n", (int)numdevs);
+ 
+@@ -1006,7 +1013,8 @@
+   * Clean up ....
+   */
+ 
+-  libusb_free_device_list(list, 1);
++  if (numdevs >= 0)
++    libusb_free_device_list(list, 1);
+   libusb_exit(NULL);
+ 
+   return (NULL);
+--- a/test/run-stp-tests.sh
++++ b/test/run-stp-tests.sh
+@@ -763,7 +763,7 @@
+ fi
+ 
+ # Warning log messages
+-count=`$GREP '^W ' /tmp/cups-$user/log/error_log | wc -l | awk '{print $1}'`
++count=`$GREP '^W ' /tmp/cups-$user/log/error_log | grep -v 'Unable to initialize USB access via libusb, libusb error' | wc -l | awk '{print $1}'`
+ if test $count != 9; then
+ 	echo "FAIL: $count warning messages, expected 9."
+ 	$GREP '^W ' /tmp/cups-$user/log/error_log