Comment 49 for bug 79172

This problem is not limited to MacBooks. I see the same thing happening on a
Dell Precision 690 Workstation. If I am using a USB keyboard, you cannot switch
option in the bootloader for the LiveCD 7 test4. If you use a PS2 keyboard, it
works fine.

Also, the keyboard works fine with the BIOS since I can use it to select all the
options needed to boot from CD. So keyboard operation and connectivity through a
USB hub and plugged directly into the machine have all been verified and all do
not work with the bootloader.