[Gutsy] X crash when evdev used "Dev Phys" instead of device

[luis]

Binary package hint: xserver-xorg-input-evdev

Multiseat configuration on gutsy. If my xorg.conf file uses for the keyboards and mice lines like:
Option "Device" "/dev/input/eventX"
then X works (sometimes, but that's another problem, with evdev as well, trying to use the PCSpeaker as a keyboard!!!. It's been reported elsewhere). If I use instead the line that the man page recommends:
Option "Dev Phys" "usb-0000:00:13.0-2.2/input1"
then X crashes with a signal 11:

Backtrace:
0: /usr/X11R6/bin/X(xf86SigHandler+0x81) [0x80c95d1]
1: [0xffffe420]
2: /usr/lib/xorg/modules/input//evdev_drv.so [0xb783f62d]
3: /usr/lib/xorg/modules/input//evdev_drv.so(evdevNewDriver+0x4c) [0xb783fd5c]
4: /usr/lib/xorg/modules/input//evdev_drv.so [0xb783e7f8]
5: /usr/X11R6/bin/X(InitInput+0x188) [0x80a8178]
6: /usr/X11R6/bin/X(main+0x361) [0x8076dd1]
7: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7d29050]
8: /usr/X11R6/bin/X(FontFileCompleteXLFD+0x1e1) [0x8076241]

Fatal server error:
Caught signal 11. Server aborting

This is a fully updated gutsy install on a dual core Athlon 64 X2 5600+ processor, 2GB memory dual graphics card (ATI X800 PCI-e and ATI mach64 AIW PCI)
None of the other evdev related X crashes seem to be the same as this one:103902,39878,56751. I'll attach logs and config files next.

[luis (luis-montes)]

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lspci
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00:00.0 Host bridge: ATI Technologies Inc RS690 Host Bridge
00:02.0 PCI bridge: ATI Technologies Inc Unknown device 7913
00:07.0 PCI bridge: ATI Technologies Inc RS690 PCI to PCI Bridge (PCI Express Port 3)
00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA
00:13.0 USB Controller: ATI Technologies Inc SB600 USB (OHCI0)
00:13.1 USB Controller: ATI Technologies Inc SB600 USB (OHCI1)
00:13.2 USB Controller: ATI Technologies Inc SB600 USB (OHCI2)
00:13.3 USB Controller: ATI Technologies Inc SB600 USB (OHCI3)
00:13.4 USB Controller: ATI Technologies Inc SB600 USB (OHCI4)
00:13.5 USB Controller: ATI Technologies Inc SB600 USB Controller (EHCI)
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 14)
00:14.1 IDE interface: ATI Technologies Inc SB600 IDE
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia
00:14.3 ISA bridge: ATI Technologies Inc SB600 PCI to LPC Bridge
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:00.0 VGA compatible controller: ATI Technologies Inc R430 [Radeon X800 XL] (PCIe)
01:00.1 Display controller: ATI Technologies Inc R430 [Radeon X800 XL] (PCIe) (Secondary)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
03:05.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 08)
03:05.1 Input device controller: Creative Labs SB Live! Game Port (rev 08)
03:06.0 VGA compatible controller: ATI Technologies Inc 3D Rage Pro (rev 5c)

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/proc/bus/input/devices
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I: Bus=0017 Vendor=0001 Product=0001 Version=0100
N: Name="Macintosh mouse button emulation"
P: Phys=
S: Sysfs=/class/input/input0
U: Uniq=
H: Handlers=mouse0 event0
B: EV=7
B: KEY=70000 0 0 0 0 0 0 0 0
B: REL=3

I: Bus=0011 Vendor=0001 Product=0001 Version=ab41
N: Name="AT Translated Set 2 keyboard"
P: Phys=isa0060/serio0/input0
S: Sysfs=/class/input/input1
U: Uniq=
H: Handlers=kbd event1
B: EV=120013
B: KEY=4 2000000 3802078 f840d001 feffffdf ffefffff ffffffff fffffffe
B: MSC=10
B: LED=7

I: Bus=0003 Vendor=062a Product=0102 Version=0110
N: Name="MOSART Semi. Wireless Keyboard & Mouse"
P: Phys=usb-0000:00:13.0-2.2/input0
S: Sysfs=/class/input/input4
U: Uniq=
H: Handlers=kbd event2
B: EV=120003
B: KEY=10000 7 ff87207a c14057ff febeffdf ffefffff ffffffff fffffffe
B: LED=7

I: Bus=0003 Vendor=062a Product=0102 Version=0110
N: Name...