diff -Nru xserver-xorg-input-evdev-2.1.1/debian/changelog xserver-xorg-input-evdev-2.1.1/debian/changelog
--- xserver-xorg-input-evdev-2.1.1/debian/changelog	2009-02-10 09:53:45.000000000 -0800
+++ xserver-xorg-input-evdev-2.1.1/debian/changelog	2009-02-10 09:53:45.000000000 -0800
@@ -1,3 +1,9 @@
+xserver-xorg-input-evdev (1:2.1.1-1ubuntu3~errmsgs1) jaunty; urgency=low
+
+  * Add evdevcachecompare_errmsgs.patch: instrumentation for bug #327175
+
+ -- Bryce Harrington <bryce@ubuntu.com>  Tue, 10 Feb 2009 09:46:55 -0800
+
 xserver-xorg-input-evdev (1:2.1.1-1ubuntu2) jaunty; urgency=low
 
   * Add 100_exclude_touchscreen_pos.patch as cherry-pick from upstream:
diff -Nru xserver-xorg-input-evdev-2.1.1/debian/patches/evdevcachecompare_errmsgs.patch xserver-xorg-input-evdev-2.1.1/debian/patches/evdevcachecompare_errmsgs.patch
--- xserver-xorg-input-evdev-2.1.1/debian/patches/evdevcachecompare_errmsgs.patch	1969-12-31 16:00:00.000000000 -0800
+++ xserver-xorg-input-evdev-2.1.1/debian/patches/evdevcachecompare_errmsgs.patch	2009-02-10 09:53:45.000000000 -0800
@@ -0,0 +1,88 @@
+diff -Nurp patched/src/evdev.c working/src/evdev.c
+--- patched/src/evdev.c	2009-02-10 09:31:26.000000000 -0800
++++ working/src/evdev.c	2009-02-10 09:43:06.000000000 -0800
+@@ -1214,8 +1214,10 @@ EvdevCacheCompare(InputInfoPtr pInfo, BO
+         goto error;
+     }
+ 
+-    if (compare && strcmp(pEvdev->name, name))
++    if (compare && strcmp(pEvdev->name, name)) {
++        xf86Msg(X_ERROR, "device name changed: %s != %s\n", pEvdev->name, name);
+         goto error;
++    }
+ 
+     if (ioctl(pInfo->fd,
+               EVIOCGBIT(0, sizeof(bitmask)), bitmask) < 0) {
+@@ -1223,8 +1225,10 @@ EvdevCacheCompare(InputInfoPtr pInfo, BO
+         goto error;
+     }
+ 
+-    if (compare && memcmp(pEvdev->bitmask, bitmask, sizeof(bitmask)))
++    if (compare && memcmp(pEvdev->bitmask, bitmask, sizeof(bitmask))) {
++        xf86Msg(X_ERROR, "device bitmask has changed\n");
+         goto error;
++    }
+ 
+ 
+     if (ioctl(pInfo->fd,
+@@ -1233,8 +1237,10 @@ EvdevCacheCompare(InputInfoPtr pInfo, BO
+         goto error;
+     }
+ 
+-    if (compare && memcmp(pEvdev->rel_bitmask, rel_bitmask, sizeof(rel_bitmask)))
++    if (compare && memcmp(pEvdev->rel_bitmask, rel_bitmask, sizeof(rel_bitmask))) {
++        xf86Msg(X_ERROR, "device rel_bitmask has changed\n");
+         goto error;
++    }
+ 
+     if (ioctl(pInfo->fd,
+               EVIOCGBIT(EV_ABS, sizeof(abs_bitmask)), abs_bitmask) < 0) {
+@@ -1242,8 +1248,10 @@ EvdevCacheCompare(InputInfoPtr pInfo, BO
+         goto error;
+     }
+ 
+-    if (compare && memcmp(pEvdev->abs_bitmask, abs_bitmask, sizeof(abs_bitmask)))
++    if (compare && memcmp(pEvdev->abs_bitmask, abs_bitmask, sizeof(abs_bitmask))) {
++        xf86Msg(X_ERROR, "device abs_bitmask has changed\n");
+         goto error;
++    }
+ 
+     if (ioctl(pInfo->fd,
+               EVIOCGBIT(EV_KEY, sizeof(key_bitmask)), key_bitmask) < 0) {
+@@ -1251,8 +1259,10 @@ EvdevCacheCompare(InputInfoPtr pInfo, BO
+         goto error;
+     }
+ 
+-    if (compare && memcmp(pEvdev->key_bitmask, key_bitmask, sizeof(key_bitmask)))
++    if (compare && memcmp(pEvdev->key_bitmask, key_bitmask, sizeof(key_bitmask))) {
++        xf86Msg(X_ERROR, "device key_bitmask has changed\n");
+         goto error;
++    }
+ 
+     if (ioctl(pInfo->fd,
+               EVIOCGBIT(EV_LED, sizeof(led_bitmask)), led_bitmask) < 0) {
+@@ -1260,8 +1270,10 @@ EvdevCacheCompare(InputInfoPtr pInfo, BO
+         goto error;
+     }
+ 
+-    if (compare && memcmp(pEvdev->led_bitmask, led_bitmask, sizeof(led_bitmask)))
++    if (compare && memcmp(pEvdev->led_bitmask, led_bitmask, sizeof(led_bitmask))) {
++        xf86Msg(X_ERROR, "device led_bitmask has changed\n");
+         goto error;
++    }
+ 
+     memset(absinfo, 0, sizeof(absinfo));
+ 
+@@ -1277,8 +1289,10 @@ EvdevCacheCompare(InputInfoPtr pInfo, BO
+         }
+     }
+ 
+-    if (compare && memcmp(pEvdev->absinfo, absinfo, sizeof(absinfo)))
+-            goto error;
++    if (compare && memcmp(pEvdev->absinfo, absinfo, sizeof(absinfo))) {
++        xf86Msg(X_ERROR, "device absinfo has changed\n");
++        goto error;
++    }
+ 
+     /* cache info */
+     if (!compare)
diff -Nru xserver-xorg-input-evdev-2.1.1/debian/patches/series xserver-xorg-input-evdev-2.1.1/debian/patches/series
--- xserver-xorg-input-evdev-2.1.1/debian/patches/series	2009-02-10 09:53:45.000000000 -0800
+++ xserver-xorg-input-evdev-2.1.1/debian/patches/series	2009-02-10 09:53:45.000000000 -0800
@@ -1 +1,2 @@
 100_exclude_touchscreen_pos.patch
+evdevcachecompare_errmsgs.patch