I've been seeing the same problem, and have managed to get a backtrace
(I used DEB_BUILD_OPTIONS=nostrip for dpkg-buildpackage)
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb799e6d0 (LWP 3953)]
xf86WcmDevOpen (pWcm=0xb159428) at ../../../src/xdrv/xf86Wacom.c:794
794 if (common->fd_refs == 0)
(gdb) bt
#0 xf86WcmDevOpen (pWcm=0xb159428) at ../../../src/xdrv/xf86Wacom.c:794
#1 0xb786d9c2 in xf86WcmDevProc (pWcm=0xb159428, what=0) at
../../../src/xdrv/xf86Wacom.c:1034
#2 0x0808662f in ActivateDevice ()
#3 0x080d89a4 in OpenInputDevice ()
#4 0x0818bf8a in ProcXOpenDevice ()
#5 0x08187713 in ?? ()
#6 0x0808d57f in Dispatch ()
#7 0x080722ed in main ()
(gdb) l
789 /* Device has been open and not autoprobed */
790 if (priv->wcmDevOpenCount)
791 return TRUE;
792
793 /* open file, if not already open */
794 if (common->fd_refs == 0)
795 {
796 #ifdef LINUX_INPUT
797 /* Autoprobe if necessary */
798 if ((common->wcmFlags & AUTODEV_FLAG) &&
(gdb) up
#1 0xb786d9c2 in xf86WcmDevProc (pWcm=0xb159428, what=0) at
../../../src/xdrv/xf86Wacom.c:1034
1034 if (!xf86WcmDevOpen(pWcm))
(gdb) l
1029 * register even a 'pad' which doesn't "SendCoreEvents"
1030 */
1031 case DEVICE_INIT:
1032 priv->wcmDevOpenCount = 0;
1033 priv->wcmInitKeyClassCount = 0;
1034 if (!xf86WcmDevOpen(pWcm))
1035 {
1036 DBG(1, priv->debugLevel,
ErrorF("xf86WcmProc INIT FAILED\n"));
1037 return !Success;
1038 }
--
x11 won't start after upgrade to jaunty
https://bugs.launchpad.net/bugs/325101
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