PS/2 mouse not working after upgrade to kernel 2.6.0

[Kevin Wortman <kwortman@ics.uci.edu>]

Greetings,

I am running Debian testing on an i686.  I have a (corded) Logitech 
TrackMan Marble FX PS/2 trackball which works perfectly with kernel 
2.4.24 from testing.  I installed kernel-image-2.6.0-1-686, and when I 
start X I get the following error:

(EE) xf86OpenSerial: Cannot open device /dev/psaux
       No such device.
(EE) Generic Mouse: cannot open input device
(EE) PreInit failed for input device "Generic Mouse"
(II) UnloadModule: "mouse"
(WW) No core pointer registered
No core pointer

I tried to cat /dev/psaux and /dev/input/mice and /dev/input/mouse0 , 
and all give a device not found error, which led me to believe the 
kernel module was not loaded.  But my dmesg contains

input: PS2++ Logitech Mouse on isa0060/serio1

And the psmouse module shows up in lsmod.  So it seems that the module 
is indeed loaded and talking to the mouse; but the devices are not 
working for some reason.

Any suggestions?

Thanks,
Kevin Wortman