While this was initially the explanation given they have since flip flopped.
The flip flop occurred because the FCC explicitly said there was no such
requirement. Everything suggests a financial motive.
I also want to point out that while IBM/Lenovo may have been the first
company to implement this they are not the only company implementing a white
list.
I can confirm these restrictions are in place on at least some HP, Lenovo,
IBM, Dell, and Toshiba notebooks. At this time I don't believe there to be
any other manufacturers implementing such restrictions on the installable
PCI/PCIe cards.
