Ubuntu / Apple :: MacBook 3,1 Can't Get Hibernate To Work

I've recently installed Ubuntu 10.04 (amd64) on my MacBook 3,1 (1GB memory). Most things work perfectly on install, and I've got the iSight working now too!

However, although suspend works fine, hibernate does not. When I try to hibernate, the screen goes blank with the back light on for a few seconds, then the screen goes off completely for about 0.1 of a scond and I hear the optical drive whirr (like it does when booting), and then about 4 or 5 seconds after that it finally powers off.

Then, when I restart, I see the rEFIt menu, then the GRUB menu and it appears to boot like normal and *not* resume from hibernate!

I'm not sure what log I should look in? When I look in /var/log/pm-suspend.log the last line says "performing hibernate", but there's nothing about even attempting to resume.

UPDATE: Forgot to mention, I have a swap partition that is larger than 1GB.

UPDATE 2: Also, after attempting to hibernate, when the system restarts, WiFi has been disabled -- I have to double-tap (right-click) on the WiFi icon and re-enable it. I *think* this is because the hibernate process disables networking, but it then fails to re-enable it because is fails to resume.