[arch-general] Laptop reboots instead of resume from suspend

I'm using an Inspiron 1720, GeForce 8600M GT, Arch i686. If I update to any kernel after 2.6.31.6-1 then the laptop reboots from suspend or hibernate. According to pm-suspend.log the suspend was fine and there are n problems in the other logs. It just reboots. Anyone else seen this, or any suggestions for a fix? -- Dave.