If I try to suspend or hibernate on my Acer Aspire 7551 laptop with Ubuntu 10.04 64bit I can't get it to wake back up.
When I open the lid after suspending I hit a key and see the power button light up but then nothing else happens. FN f2 or FN f4 doesn't help either.
I have to hard power it down in order to get it running again.
I installed with the regular install package and I have a swap partition at /dev/sda5 of 11GB.
For now I set it to go to blank screen when I close the lid but I consider that a temporary solution so I don't lose my work.