Since the 2.6.13 kernel was released some time ago, I’ve heard plenty of negative commentary about changes within it. From referring to the Fedora-list mailing list, it appears as though there were plenty of rough edges. Anyways, using my FC4 Kernel Notes, I followed through my procedure and installed version 126.96.36.199 from source.
The first observation I noticed was that it didn’t seem much different from my last 2.6.12 kernel or my last 2.6.11 FC4 kernel. The only major thing was that my ACPI was broken for S3. I can enter Suspend to RAM (STR) but it won’t resume properly. Normally on previous 2.6.9 and previous kernels, the OS would resume, but I lost input, screen, mouse or some other hardware. In this case not even the PowerButton works correctly. I need some more experimentation here.