diff --git a/system-config-printer-InstallPrinterDrivers-debug.patch b/system-config-printer-InstallPrinterDrivers-debug.patch
new file mode 100644
index 0000000..d1df4ac
--- /dev/null
+++ b/system-config-printer-InstallPrinterDrivers-debug.patch
@@ -0,0 +1,43 @@
+diff -up system-config-printer-1.2.5/installdriver.py.InstallPrinterDrivers-debug system-config-printer-1.2.5/installdriver.py
+--- system-config-printer-1.2.5/installdriver.py.InstallPrinterDrivers-debug	2010-10-12 17:03:22.000000000 +0100
++++ system-config-printer-1.2.5/installdriver.py	2010-10-14 14:09:49.205869035 +0100
+@@ -22,6 +22,7 @@
+ import dbus
+ import dbus.glib
+ import dbus.service
++from debug import debugprint
+ 
+ class PrinterDriversInstaller(dbus.service.Object):
+     DBUS_PATH  = "/com/redhat/PrinterDriversInstaller"
+@@ -43,8 +44,12 @@ class PrinterDriversInstaller(dbus.servi
+         obj = bus.get_object ("org.freedesktop.PackageKit",
+                               "/org/freedesktop/PackageKit")
+         proxy = dbus.Interface (obj, "org.freedesktop.PackageKit.Modify")
+-        proxy.InstallPrinterDrivers (0, ["MFG:%s;MDL:%s;" % (mfg, mdl)],
+-                                     "hide-finished",
++        xid = 0
++        resources = ["MFG:%s;MDL:%s;" % (mfg, mdl)]
++        interaction = "hide-finished"
++        debugprint ("Calling InstallPrinterDrivers (%s, %s, %s)" %
++                    (repr (xid), repr (resources), repr (interaction)))
++        proxy.InstallPrinterDrivers (xid, resources, interaction,
+                                      reply_handler=reply_handler,
+                                      error_handler=error_handler,
+                                      timeout=3600)
+diff -up system-config-printer-1.2.5/ppdsloader.py.InstallPrinterDrivers-debug system-config-printer-1.2.5/ppdsloader.py
+--- system-config-printer-1.2.5/ppdsloader.py.InstallPrinterDrivers-debug	2010-10-13 13:11:16.000000000 +0100
++++ system-config-printer-1.2.5/ppdsloader.py	2010-10-14 14:09:49.207994422 +0100
+@@ -163,8 +163,11 @@ class PPDsLoader:
+             obj = self._bus.get_object ("org.freedesktop.PackageKit",
+                                         "/org/freedesktop/PackageKit")
+             proxy = dbus.Interface (obj, "org.freedesktop.PackageKit.Modify")
+-            proxy.InstallPrinterDrivers (xid, [self._device_id],
+-                                         "hide-finished",
++            resources = [self._device_id]
++            interaction = "hide-finished"
++            debugprint ("Calling InstallPrinterDrivers (%s, %s, %s)" %
++                        (repr (xid), repr (resources), repr (interaction)))
++            proxy.InstallPrinterDrivers (xid, resources, interaction,
+                                          reply_handler=self._packagekit_reply,
+                                          error_handler=self._packagekit_error,
+                                          timeout=3600)
diff --git a/system-config-printer-mfg-mdl.patch b/system-config-printer-mfg-mdl.patch
new file mode 100644
index 0000000..301e1a1
--- /dev/null
+++ b/system-config-printer-mfg-mdl.patch
@@ -0,0 +1,21 @@
+diff -up system-config-printer-1.2.5/ppdsloader.py.mfg-mdl system-config-printer-1.2.5/ppdsloader.py
+--- system-config-printer-1.2.5/ppdsloader.py.mfg-mdl	2010-10-14 14:09:49.207994422 +0100
++++ system-config-printer-1.2.5/ppdsloader.py	2010-10-14 16:21:15.821926650 +0100
+@@ -133,6 +133,8 @@ class PPDsLoader:
+             if (status != ppds.STATUS_SUCCESS and
+                 self._packagekit_queried == False and
+                 self._local_cups == True):
++                self._gpk_device_id = "MFG:%s;MDL:%s;" % (devid_dict["MFG"],
++                                                          devid_dict["MDL"])
+                 self._query_packagekit ()
+                 self._packagekit_queried = True
+                 return
+@@ -163,7 +165,7 @@ class PPDsLoader:
+             obj = self._bus.get_object ("org.freedesktop.PackageKit",
+                                         "/org/freedesktop/PackageKit")
+             proxy = dbus.Interface (obj, "org.freedesktop.PackageKit.Modify")
+-            resources = [self._device_id]
++            resources = [self._gpk_device_id]
+             interaction = "hide-finished"
+             debugprint ("Calling InstallPrinterDrivers (%s, %s, %s)" %
+                         (repr (xid), repr (resources), repr (interaction)))
diff --git a/system-config-printer.spec b/system-config-printer.spec
index 9d43211..d8896cf 100644
--- a/system-config-printer.spec
+++ b/system-config-printer.spec
@@ -7,7 +7,7 @@
 Summary: A printer administration tool
 Name: system-config-printer
 Version: 1.2.5
-Release: 1%{?dist}
+Release: 3%{?dist}
 License: GPLv2+
 URL: http://cyberelk.net/tim/software/system-config-printer/
 Group: System Environment/Base
@@ -16,6 +16,8 @@ Source0: http://cyberelk.net/tim/data/system-config-printer/1.2/%{name}-%{versio
 Source1: http://cyberelk.net/tim/data/pycups/pycups-%{pycups_version}.tar.bz2
 # Python bindings for libsmbclient
 Source2: http://pypi.python.org/packages/source/p/pysmbc/pysmbc-%{pysmbc_version}.tar.bz2
+Patch1: system-config-printer-InstallPrinterDrivers-debug.patch
+Patch2: system-config-printer-mfg-mdl.patch
 Patch101: pysmbc-doczip.patch
 BuildRequires: cups-devel >= 1.2
 BuildRequires: python-devel >= 2.4
@@ -75,6 +77,13 @@ printers.
 %prep
 %setup -q -a 1 -a 2
 
+# Show debug output whenever InstallPrinterDrivers is called.
+%patch1 -p1 -b .InstallPrinterDrivers-debug
+
+# Always use MFG and MDL fields for InstallPrinterDrivers interface
+# (bug #643073).
+%patch2 -p1 -b .mfg-mdl
+
 pushd pysmbc-%{pysmbc_version}
 %patch101 -p1 -b .doczip
 popd
@@ -198,6 +207,13 @@ rm -rf %buildroot
 exit 0
 
 %changelog
+* Thu Oct 14 2010 Tim Waugh <twaugh@redhat.com> - 1.2.5-3
+- Always use MFG and MDL fields for InstallPrinterDrivers interface
+  (bug #643073).
+
+* Thu Oct 14 2010 Tim Waugh <twaugh@redhat.com> - 1.2.5-2
+- Show debug output whenever InstallPrinterDrivers is called.
+
 * Wed Oct 13 2010 Tim Waugh <twaugh@redhat.com> - 1.2.5-1
 - 1.2.5:
   - CMD-field matching for PPDs (bug #630058).
diff --git a/upstream-key-pysmbc.gpg b/upstream-key-pysmbc.gpg
new file mode 100644
index 0000000..666b4a9
--- /dev/null
+++ b/upstream-key-pysmbc.gpg
@@ -0,0 +1,30 @@
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