I am using 11.04 64bit on Dell Inspiron N5010. I have this strange problem, if I leave my laptop suspended for more than 20 minutes(approx.) then it does not resume.
It works fine if I resume within or less than 20 minutes. I have 4GB ram and 8GB swap space, my system have ATI 5000 series graphics card and and I am using proprietary drivers installed via jockey.