I'm using a brand new T400s with a multitouch screen, on a fresh
installation of 10.10.  I am also seeing the problem, but I'm seeing the
success of recovering from sleep depend on how long the laptop is
sleeping.  I've disabled sleep from power management, but it still goes
to sleep.  I've turned on the sleep inhibitor, and it still goes to
sleep after a while.  I can't seem to find a way to keep it from going
to sleep.

Another problem I'm experiencing may be related to the multitouch
screen.  When I close the lid with my web browser up, and come back to
the computer 1/2 hr or so later, I find many more web browser windows
open with many sites open.  I assume that screen taps are being
registered all over.  It's possible these taps may disable my sleep
inhibitor, which eventually causes my laptop to freeze up.  These two
bugs make a horrible combination :(  The random screen taps only happen
when the lid is closed.

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suspend / hibernate not working on Lenovo Thinkpad T400s
https://bugs.launchpad.net/bugs/666172
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