Similar problems, resolved with an upgrade to kernel 2.6.32-21-generic.
Initial experience: upgrading from 9.04 to 10.04 resulted in frozen
keyboard/mouse on starting X11. Only exit was a hard boot (no serial
console or remote system from which to ssh in).
System is a Lenovo T61 laptop.
Experimenting with rescue boot showed that system was responsive to
keyboard at BIOS, GRUB, and pre-X system session. Booting single-user
root mode it was possible to start X session, at which point recovery
from X was not possible. Tricks such as:
startx /usr/bin/xterm -geometry 1680x1050 -- vt12 & sleep 10; chvt 7
(where 1680x1050 is my laptop display geometry)
This would switch back to a non-X virtual console, from which keyboard
and mouse were responsive (generally killing X at this point was a Good
Thing).
I did manage to get mouse response under a 2.6.27-11-generic kernel by
modifying /etc/X11/xorg.conf to specify a mouse device:
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/psaux"
Option "Protocol" "ImPS/2"
Option "Emuate3Buttons" "false"
EndSection
... but wasn't successful in specifying a keyboard configuration (what
*IS* the default PS2 keyboard device?).
On a suggestion from irc://irc.freenode.net/#xorg, I upgraded to latest
available kernel. Keyboard/mouse functioned with a default xorg.conf.
--
[lucid] Keyboard and mouse freeze after grub, usb and PS/2 keyboard not working
in X
https://bugs.launchpad.net/bugs/555169
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