My OS is Ubuntu 12.04 on my laptop Lenovo T400. I had been using it quite well until this week. After suspending Ubuntu, whenever I lift the laptop lid (if the lid is closed), or press Fn key (if the lid is not closed), normally Ubuntu should wake up. But starting this week, I couldn't wake it up either way for twice after I carrie my lap in my  backpack  running to another place. When the problem happens, the laptop light for battery is on, which is normal for suspended status (if it is turned off, there should be no light on). the laptop light for reading/writing from/to HDD is only about 1/4 of full lightness on, which I guess suggests it meets some difficulty of reading data from HDD for waking up?Is this related to some recent update of Ubuntu 12.04? Or is it a signal of onset of failure of some hardware part? Or ...? Thanks!Added:As terdon suggested, I upload the log files /var/log/pm-* before and after the problem happens here. (the files ending in .1 in their file names are those when I suspended Ubuntu, the files without .1 are those most recent log files. Note: after the problem happens, I restarted my Ubuntu, and successfully suspended and woke Ubuntu.The output of my hardware info output by lshw is here
Not wake up after suspension
ubuntu;suspend;hibernate