I have the same problem on a new Thinkpad T40 laptop -- sometimes on
unsuspend, I get to see the cursor for a second or so, and then it
vanishes and the laptop goes back to sleep. It's not easy to reproduce
-- the first time I managed to reproduce it while acpi_listen was
running was today after a week of occasional trying -- but it does occur
quite regularly. Relevant features:

 * Suspend was with a power cable plugged in and batteries fully charged; 
unsuspend was on battery power 45 mins later.
 * The wireless network changed between the suspend and unsuspend locations: on 
the second (successful) resume attempt, I got a dialog saying that the 
authentication credentials had been forgotten for the new wireless network 
(which I've used many times before)
 * This laptop has two batteries, which I've noticed has confused Ubuntu before 
(I get "critically low battery" warnings when battery #1 is near empty, even 
though battery #2 is full)

I think this may be related to bug #31935, but was urged to submit a new
report rather than reopen that one... this one seems to be such a new
bug on the same issue. I'll attach an acpi_listen log from this double-
unsuspend in a moment.

-- 
Laptop automatically suspends right after resume
https://bugs.launchpad.net/bugs/492649
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