W520 not going in Suspend to RAM Mode properly on Linux

[kreyszig]

Hi,

so I have a W520 and it fails to go into suspend to RAM mode properly on Linux after 4 previously successful attempts. So it works properly 4 times, then the fifth time the screen turns black, but the laptop does not reach the point where the suspend LED turns on and it becomes unresponsive. I am using the kernel 3.5.7 and I was getting the same problem with previous versions. I do not observe this problem with Windows 7, so it seems that there is something like a memory leak that prevents suspend to work properly more than 4 times. The other thing I noticed is that the time on the laptop is completely off when I reboot the machine. Does someone have a clue about how I could fix this problem?

Thanks!!