I'm still learning the ropes here and working my way through both "Linux Kernel in a Nutshell" and "Linux Device Drivers" but not finished as yet, so it might be premature on my part to ask this question. I don't think finishing either book will answer the question so I'll risk it. I'm running OpenSuse (11.1 I think) which has a "3.1.10-1.16-desktop" Kernel. In order to learn the ropes and move towards contribution I've built the 3.6.0 Kernel and with the help of "Linux Kernel in a Nutshell" have compiled into the kernel all the modules which OpenSuse's 3.1.10 kernel was using. So I've all the modules in there. My problem is that the when I shut down the lid of the netbook both kernel's Sleep or Suspend (not sure which is which) and flash a light to signify that the netbook is suspended. Now on the 3.1.10 kernel when I reopen the netbook it comes back to life and everybody is happy. When I reopen the 3.6.0 Kernel, even though the led is flashing to signify that the computer is asleep or suspended, the computer goes back to BIOS powerup. So a complete reset is initiated. I'm not going to ask ye to fix this but I'm wondering how do I start finding the source of this problem? I've looked in /var/log/messages and nothing as yet jumps out at me. I suppose I really need to have some idea what module in the kernel I should be looking into but there's a lot of ACPI modules in there. If anyone could suggest how one proceeds I'd be very grateful.