13. Reboot and test

At this point you should reboot your machine. When your system comes back up (assuming of course that everything went well and you still have a system), check to see what kernel you're running with uname -a . It should show you the one you just built. You also need to make sure the correct patch was installed. You can do that with dmesg | grep ACPI.*Subsystem\ revision . It should give the output: ACPI: Subsystem revision 20021212 . The revision is the date the patch was released. This number will be different than mine if you are not using the 2.4.20 kernel. To look at all ACPI-related bits that were loaded/started when your system rebooted, do this: dmesg | grep ACPI . dmesg prints your boot messages and grep ACPI makes sure that only ACPI-related messages are printed.

You can also check to see what version you're using with cat /proc/acpi/info . Don't believe everything you read though. My output says that S3 is a supported state, but we already know it's not. It does give the correct version though, which is useful.