diff -Nru transmission-1.92/debian/changelog transmission-1.92/debian/changelog
--- transmission-1.92/debian/changelog	2010-03-23 01:43:32.000000000 +0000
+++ transmission-1.92/debian/changelog	2010-04-14 00:15:12.000000000 +0100
@@ -1,3 +1,9 @@
+transmission (1.92-0ubuntu2) lucid; urgency=low
+
+  * Default to the fast preallocation mode. (LP: #538580) 
+
+ -- Krzysztof Klimonda <kklimonda@syntaxhighlighted.com>  Wed, 14 Apr 2010 01:14:17 +0200
+
 transmission (1.92-0ubuntu1) lucid; urgency=low
 
   [ Krzysztof Klimonda ]
diff -Nru transmission-1.92/debian/patches/default_to_fast_preallocation.patch transmission-1.92/debian/patches/default_to_fast_preallocation.patch
--- transmission-1.92/debian/patches/default_to_fast_preallocation.patch	1970-01-01 01:00:00.000000000 +0100
+++ transmission-1.92/debian/patches/default_to_fast_preallocation.patch	2010-04-14 00:15:12.000000000 +0100
@@ -0,0 +1,18 @@
+Description: Default to the fast preallocation mode.
+Origin: upstream
+Bug-Ubuntu: https://bugs.edge.launchpad.net/bugs/538580
+
+Index: /trunk/libtransmission/session.c
+===================================================================
+--- a/libtransmission/session.c	(revision 10391)
++++ b/libtransmission/session.c	(revision 10463)
+@@ -261,9 +261,5 @@
+     tr_bencDictAddBool( d, TR_PREFS_KEY_PEX_ENABLED,              TRUE );
+     tr_bencDictAddBool( d, TR_PREFS_KEY_PORT_FORWARDING,          TRUE );
+-#ifdef HAVE_FALLOCATE64
+-    tr_bencDictAddInt ( d, TR_PREFS_KEY_PREALLOCATION,            TR_PREALLOCATE_FULL );
+-#else
+     tr_bencDictAddInt ( d, TR_PREFS_KEY_PREALLOCATION,            TR_PREALLOCATE_SPARSE );
+-#endif
+     tr_bencDictAddStr ( d, TR_PREFS_KEY_PROXY,                    "" );
+     tr_bencDictAddBool( d, TR_PREFS_KEY_PROXY_AUTH_ENABLED,       FALSE );
diff -Nru transmission-1.92/debian/patches/series transmission-1.92/debian/patches/series
--- transmission-1.92/debian/patches/series	2010-03-23 01:43:32.000000000 +0000
+++ transmission-1.92/debian/patches/series	2010-04-14 00:15:12.000000000 +0100
@@ -4,4 +4,5 @@
 libnatpmp_freebsd_ftbfs.patch
 dont_build_libevent.patch
 disable_web_ui.patch
+default_to_fast_preallocation.patch
 99_autoreconf.patch