Comment 4 for bug 580757

I have a similar problem. I have a system with 4GB of RAM, and more than sufficient space in a swap partition (about 8GB). I can hibernate more than once (at least twice), but if more than a small fraction of the RAM is in use (e.g., say about 2GB or more), then the suspend to disk process hangs. It seems like it is about to shut down (e.g., USB and wireless devices are turned off), but ultimately it never writes the RAM to disk. I can hear the CPU fan spinning up suggesting something is taking alot of CPU processing, and there is infrequent disk activity (but nothing like the consistently lit state of the disk indicator during a successful hibernate). After about 10 minutes or so, I gave up and powered it down. I could try letting it go longer, but that seems pointless, as 10 minutes is ample time to close everything on the desktop and shut down normally.

Is there something that tries to compress the RAM during the hibernate process to conserve space? If so, is there a way to disable that?