With the 305 kernel the thinkpad 600 keyboard and mouse randomly fail to work each boot. With the original test-2 kernel they work reliably.
Same with the 305 kernel on a Dell 650 (Xeon) USB Keyboard / Mouse. Dell is using an ~Intel motherboard & chipset. Fails everytime as soon kernel takes over from grub. Worked fine with test-2 kernel
Problem has cleared up on 2.6.5-1 322 kernel, same hardward. April 14 development clean installation.
Fixed in test3 for me