There's another report of this at http://lwn.net/Articles/273239/

"When I suspend/resume my laptop (A Dell Inspiron E1505 that came pre-installed 
with Ubuntu,
since upgraded to x86-64 Kubuntu 7.10), about 10% of the time the keyboard and 
touchpad are
dead when it comes back.  The rest of the system is still working fine; if I 
press the power
button the "log out/suspend/hibernate/restart/turn off" dialog comes up 
(useless if I have no
mouse and keyboard), and if I plug in a USB mouse or USB keyboard I can use the 
system
normally.  (And if I suspend and resume it again via said USB peripherals, the
keyboard/touchpad controller usually revives itself when it comes back.)

If I don't happen to be carrying USB peripherals around with me, the only thing 
I can do is
hold the darn power button down until it hard powers off, and then reboot it.  
I wind up doing
this, on average, about twice a month."

-- 
regression: Keyboard + Synaptic Touchpad randomly do not return from suspend on 
Dell 640m
https://bugs.launchpad.net/bugs/99755
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