Two busy weeks - still not hibernating with Ubuntu

I still have problem with my Ubuntu 9.10 on my CS31 Vaio.

An old problem of Ubuntu installer related to hibernation is the swap size. There is a need to have a swap size as big as the RAM size. So, I learned that the swap is used to hibernate. Cool and logical. Usually Linux install are recommending a swap size equal to two times the RAM size. Considering the extra requirement of the hibernate swap the allocation of 12 GB - (2+1) x 4G - of swap for 4GB of RAM makes sense.

Anyway, it is not my problem. I saw may posts on the Ubuntu forum on this issue but none of the tips worked. Some net rumors pointed me to think  hat it could be 64 bits related... So I tried 32 bits install, no change - I moved back to 9.04 no changes either ! Glad to see it is not a Karmic problem... Clearly the power - ACPI management changes depending on the video card driver. I swapped the Ubuntu driver by the proprietary Nvidia driver. Good for performance and extra setup controls, but nothing changes on my hibernation issue.

Will I find the time to dig into the ACPI stuff? It is far from my day to day business.